Here's what's been uncovered so far including new classes, guns perks and a few other new features:
Infinite Warfare new classes are called Rigs
There are six Rigs that seem to offer a pre-set range of weapons, perks and loadouts. It's hard to see in the video but there are definitely some sniper-like and heavy options and one appears to be a robot.
Infinite Warfare's guns
Most of Infinite Warfare's guns seem to be a familiar looking take on futuristic assault rifles, SMG, Snipers, LMGs and some slightly more fanciful heavy options.
Assault rifles
NV4, R3K, KBAR-32, Type-2, Volk
SMGs
Erad, FHR40, Karma-45, RPR Evo, HVR
LMGs
R.A.W., Mauler, Titan
Sniper rifles
KBS longbow, EBR-000
Heavy weapons
Reaver, DCM-8, Banshee
Infinite Warfare's perks
Most of these perks are familiar from previous games with only Pin Point and Momentum causing a few head scratches. Current theories are suggesting Pin Point could be a Toughness/Focus replacement, and Momentum either Marathon/Extreme Conditioning or Afterburner analogue.
Infinite Warfare's map now shows height and call outs
More screenshots suggests Infinite Warfare's new map will show different heights, suggesting more verticality in multiplayer. It also shows call outs, so player-triggered messages to point at areas that need attention mid-match.
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My mobile won't let me link pics at the right spots but there's some good info on here.