so there is quite a alot of raid bosses that drob mounts now
can you get mount form eledon, horridn and jikun in lfr / with extra roll?
No, only on Normal or Heroic.
You could get the mount from elgalon first week but that was fixed and you have to do it on normal or HC.
Horridon does drop a mount http://www.wowhead.com/item=93666#.
Saw both mounts drop 2x now, never been able to win them
You can get a Primal Egg out of the Treasures of the Thunder King.
Yes, the new goldbags can function like the Misty Satchel of Exotic goods in regards to what you get, along with dropping Primal Eggs and LFR versions of trash raid items (soulbound or tradeable depends on whether the normal version is soulbound/tradeable).
You can not, however , win the Elegon, Horridon or Ji-kun mounts from LFR.