Toskk posted an updated calculator not too long ago using the newest iteration of Savage Roar (longer duration and 40% AP bonus). I gotta go dig it up though...
As for Primal Precision, no you do not get refunded the energy if you fail to land, it just sometimes appears that way from before when a tic happened immediately after you used the ability. Also, depending on the amount of Expertise we have passively on our gear (that is to say, not via enchants/gems/etc) we may or may not need this talent. It is certainly one you can likely out gear in later levels but will provide a nice boost early on. Remember the change to Omen of Clarity means the more we hit (both often and accurately) the more often it will go off, so we have a reason to actually get Expertise/Hit capped and not sniff at Haste that rolls our way.
As for the last question, the calculator will know for sure, I gotta find it first though :P
EDIT: Found it!
http://druid.wikispaces.com/space/sh...ulator402.html