T10 4P procs can now overwrite your "real" Rejuvs.
Hopefully this possibility was added at the
bottom of 4P's smart jump priorities. If so, it's now better in 10mans. If not, it's now worse in 25mans...
Compare the tooltips to see the Rejuv on the right hand combat log is the proc. The "real" Rejuv is cast at the top of the log. On the 2nd tick, it's overwritten by a new proc'd Rejuv which ticks for 1 less:
http://i44.tinypic.com/6p98o8.jpg
Another screenshot to show it goes on to tick the full duration:
http://i44.tinypic.com/wrjj1c.jpg
There's no "Soothing fades" until the very end, so add up my Soothing stacks (Frost Emblem Idol) if you are doubtful.