About mend pet it is step in right direction, however if they want to make it useful in raid they should make it mana free and put cooldown instead to avoid abuse.
BM got buffed with KC and mend pet change (along with melee aoe of doom changes in 2.1) but often problems still are in encounters (like 30 sec pet stones at Gruul for example). I hope they will think about pets when tuning, fixing and making new encounters...
Survival seems to be actually viable apart from master tactican proc is crap still (its better to take imp. hawk probably still).
About HM after you make it better with shots you cannot reapply it ("more powerful spell..."). The change it self is great, +330AP after 30 shots so even single hunter can max it out in around 30-40 sec, too bad melee part does not scale tho
And still no changes to Tier4, I really hope they change it later at PTR (uber shit hunter set bonuses + lack of AGI).
Also I would love to see addition to Imp. Hawk talent that it would affect Viper in some way so when I use Viper I would not loose 5 talent points, and also Animal Handler should be buffed to +4/8% hit plus mount speed changed to something useful (+skill for pets?).