That's just the natural order of things. You get more haste, ap becomes more valuable, more ap, haste become more valuable.

Is it active on live servers yet? Mine still has to same text, but IDK if it is the same deal as the HfB nerf a few weeks back.

Hotfixes like this are entirely server side.
Tooltip changes are client side, thus require a patch.

I have a question regarding Heartpierce because I guess I don't understand the PPM mechanic as well as I thought. The current models, according to what I am reading, say that Heartpierce works on a 1 PPM per weapon, and yet, I have checked and double-checkd and occasionally mine is chain proccing three or four times in a row, which would mean that PPM is not a straight "Proc Per Minute" mechanic as I currently understand it, assuming the models are correct about Heartpierce's behavior. Then again, maybe I am just confused on how exactly a PPM mechanic functions. What's the story?

Yes, and additionally, you are thinking of the term "internal cooldown" (ICD) as being "unable to proc multiple times back to back".

[Deathbringer's Will] now gives 600 haste as mutilate opposed to ArP

It should be noted, though, that Heartpierce's proc is a bit more complicated. It procs due to hits from either hand, not just the one wielding it, and each hand is 1ppm. If you have Heartpierce MH and a 1.4 speed OH, the MH proc chance is 1/(60/1.8)=0.03, and the OH proc chance is 1/(60/1.4)=0.02333. So every hit with Heartpierce itself has a 3% chance of proccing, and every hit with a 1.4 OH has a 2.3% chance. Note that these figures are not affected by haste; if you get 100% haste (meaning you swing twice as fast as normal) it's still a 3%/2.3% chance for every MH/OH hit.

It also procs from combo point builders and finishers. I'm not aware of anyone having done the testing to accurately identify the chances, but it's a good bet that it just reuses the 1ppm chances.

Last but not least, poisons proc it too. I didn't test anything but IP and DP, but I did prove that it procs from both of them (note: only from DP applications, not from the DOT ticks). In fact, it double dips: when you're at a full 5 stack of Deadly and Deadly is reapplied, inducing an Instant proc, Heartpierce can proc from both events. The best known theory is that the chance for a Heartpierce proc from any of these poison events is the same as the melee chance for the weapon which procced the poison. IP procs which are induced by Deadly stack refreshes appear to be calculated with the Deadly hand's proc chance, not the IP hand's proc chance.

yeah, MMOChamp just posted a little while ago
Deathbringer’s Will trinket will now proc haste as a replacement for armor penetration.

The buffed proc chance on Heartpiece now actually makes it the best combat offhand regardless of weapon spec unless my maths are wrong. You can easily see 2/3 or more uptime of the buff, which is >1.33 energy/sec. You lose 17% combat potency procs compared to a 1.5 speed offhand. CP is 3 energy per hit, or about ~4 energy per sec with a 1.5 offhand, so ~0.7 energy lost by using heartpiece instead.

At least in my app Heartpiece is doing extrmely well, even with HnS spec.

On the other hand, you're losing quite a few stats to get that proc - I mean, I'll concede that Heartpierce may well beat a statless 1.5 dagger of equal DPS, but the reality is that most dagger OHs you might consider (which, I might not, are usually 1.4 speed anyway) have stats on them, which Heartpierce lacks.

Consider: the energy difference between a 1.8 OH and a 1.4 OH is usually approaching 1 energy per second. Heartpierce is usually under 1.5 energy per second. So you're losing 2/3 of the proc's benefit just on speed, making the proc (effectively) weaker than it was before the buff. And before the buff, the proc was generally found to be weaker than the commensurate amount of stats. And energy regen is better (relative to raw stats) for Mutilate than it is for combat. So it's less energy, which is less good, for an amount of stats which was found to be better. As such, odds of it making it to "good" seem... kinda vanishingly small.

Admittedly I haven't run the numbers - nor do I intend to, unless a more compelling case can be made - but offhand I'd say a 264 Heartpierce *might* compete with more traditional 245 OHs, but I'd be willing to be any reasonable 251+ option will prove better in practice.

Yes, it is infact not as good as i thought it to be. Reason mostly that you lose up to 30% of the energy ticks to the proc getting refreshed before it gets to tick. If i look at numbers for my projected combat gear, the buff reaches an uptime of 85% but it has a 26% chance to refresh itself within the first 2 seconds, making it only 1.26 energy/sec instead of the estimated 1.7 at the first look.