All ready working on rogue, one of the specializations that seem more practical. I am glad that they didn't make the specializations a total game chnger though.
Numbers of players will always decline after launch. Yes black ops 2 is coming out, but alot of people getting that game didn't get halo 4 in the first place.
I think a xp cap should exist but it shouldn't be so small. The xp cap in Reach was very hard to get to for a normal player. (usually only boosters got the cap) The cap in H4 is so small that and average player can reach it.