This has been posted on before and is discussed on E&J.
On the PTR the rejuv proc was consuming the original rejuv when it "jumped" making t10 pretty much worthless. It has been fixed and now does not consume the original rejuv that proc'ed the jump and its a smart heal. Which means it acts much like our WG it goes to the lowest health person in range (not sure of the range). It still can go to pets and such if they're low though.
Let me find the link to the post talking about it.
http://www.mmo-champion.com/class-dr...to-dosent-suck
http://forums.worldofwarcraft.com/th...KShNhfqdyXn#50
Is this link working for anyone? When I click it it takes me to MMO-Druid forums... not that spacific thread.