Cross-platform squads is schweeeet! Play with your Xbox buddies on your PS3 as one squad is going to be epic. They've added some really great features to Ghost and I can see that they have listened to the criticisms raised by players of Black Ops 2.
What is troubling to me is that "Off the Grid", a perk that makes you invisible to the SatComs (old UAV) will make it possible for major camping as you stay invisible while standing still or while moving. It's only costs 2 points to use so these same campers will probably be using Juggernaut and other perks to buff them and create semi-godmode classes. Ish.
I see a few balancing patches being rolled out within the first week of release.