4t10 starts from Gunship Battle, if folks are interested. Also incidental Trauma results in there.

Doing the distributions with the new knowledge that the set bonus can proc off the initial cast as well as each tick, you end up with approximately ~15.2% increase in the number of Rejuvs in the average case. However, for a few reasons it should perform better than 15.2% increase in healing from Rejuv in the average case because it's both smart and not subject to human limitations. This has been discussed recently; we're not perfect in optimizing our button presses and/or target choices. The set bonus doesn't have those restrictions, especially not where button presses are involved.

So on fights like Festergut or Blood Queen, where there is likely always going to be a good un-rejuv'd target, the set bonus should perform exceptionally well. Festergut in Carebare's parse indicates this (though simple randomness and good luck might account for it doing a staggering 30% of the healing of the base rejuv). Carebare had 22% more Rejuv tics as a result of the set bonus, which is well above the expected. Also of note is that proc'd rejuvs had 11% less overhealing than manually cast rejuvs.

Comparatively, on Council, a fight which still has lots of damage, but of a more spikey nature with sometimes unpredictable targets, the proc fared much worse. There the proc was only 11% more effective healing from Rejuv, and actually had more overhealing, but still well within the bounds of randomness. Even in that case, 11% more effective healing from Rejuv is nothing to sneeze at, since that's generally better than what we see in practice from 4 piece T9. Averaging out the two encounters, this comes out to similar or better than 4 piece T8, which is generally seen as an excellent set bonus.

Log cropped for Gunship onwards:
World of Logs - Real Time Raid Analysis

At first glance, this makes it look extremely good. Proc healing added 17.5% to your total Rejuv healing. A lot of people were speculating that it would have a lower effectiveness ratio than ordinary Rejuvs, I thought it would be roughly equal, but it seems like it can often be slightly better. I think the smart-targeting can drop it on someone for whom the first tick will be useful with more success than a human can (no reaction time or latency).

And previously we'd thought a 13.6% increase with 6 chances to proc, but if it's actually 7 (sill have to confirm this), it would be 1/0.86 = a 16.3% increase.

Other notes:
-Spell duration is still 18 seconds, regardless of 15s tooltip (Expected this with the last minute Rejuv change they did to all ranks)
-Looks to get full/Most benefit of all talents/sp bonuses that normal Rejuv does. Carebare's tick differ by 6.5 hp healed


The one thing I noticed (only once, but still)
[22:26:09.028] Lailla's Rejuvenation is refreshed by Carebare

This was going through the combat log filtered specifically ON the SpellID... I guess it is safe (however rare) to say that it will recast itself on someone on occasion as well.

This might be considered a duh question, but can you swiftmend the rejuvenation it creates? Seems to me like a pretty big question but wasn't directly addressed in the testing as far I as saw. Not entirely clear since it has a different spell ID.
In the same vein, does it show up on grid (as "your" rejuv)? What happens if you manually cast a rejuv on a target that got a proc?

It shows on Grid as your rejuv, and you can swiftmend it.

This was expected I guess, but for confirmation:

From what I could see in the logs, if you cast a rejuv on a target that got a proc, your rejuv replaces the proc.
Also, from a quick look, it seems that the proc does NOT trigger revitalize. Can anyone confirm?

Can confirm it DOES proc Revitalize based Carebare's logs, if you look at the following query:
[{"spellNames": ["Revitalize"], "eventTypes": [8], "targetNames": ["Manly"]}, {"eventTypes": [4], "targetNames": ["Manly"], "spellIds": [53251]}, {"eventTypes": [4], "targetNames": ["Manly"], "spellIds": [70691]}, {"eventTypes": [4], "targetNames": ["Manly"], "spellIds": [48441]}]
(Essentially any Rejuv, WG on Manly as well as any revitalize on him/her)

Timestamp 22:22:45.860, 23:03:19.220, and 23:03:19.749 all show Manly gaining Rejuv (id70691) (when no Rejuv/WG was present from Carebare or Melador) and gaining revitalize during the duration of the Rejuv. Without Melador or Carebare casting their rejuv(id48441) or WG(id53251) on him/her during the timeframe.

of the 154 procs of Revitalize Manly got (from Gun Ship on) 4 were from the T10 Rejuv of the 88 Rejuvs on Manly for that duration only 3 were from the T10 the rest were from Melador or Carebare.

One more clarification: I haven't had time to dig through the logs yet, but it seems as if a proc'd Rejuv CANNOT cause another proc. Is this correct? Would probably be way too good if that were the case.

I highly doubt we would be able to find that in a log such as Carebare's. To test that would require a controlled enviroment. You would need to cast a rejuv on someone and then the second it skips(jumps, replicates, whatever word we end up using) to another cancel the original and 'wait and see'.

Something I was curious about from Shelendil's testing. Will it jump to someone when everyone is full health. From the sounds of their testing the pet would have been at full health when doing their testing. Shelendil can you confirm please.

Does the "Rejuvenation" show up in recount as a separate spell, or just WoL parses?