Maybe it's just me, but I've noticed a couple of changes:

-Respawn system is worse, more respawns in sight of an enemy
-Nanovision appears to sometimes not work? (I see someone, I turn on Nanovision, now I don't see him even while uncloaked, it can't be perked related because I've seen it at rank 1 enemies)
-Walking movement appears slower
-Default camera appears changed.
-SCAR slightly nerfed? (not sure about this one)