I like the xray vision ability. Should reduce camping and if the alternative armor abilities are effective that will be a big enough weakness for xray.
I don't like instant respawn and random weapons drop.
Instant respawn will make objective based games ridiculously frustrating.
And fighting for weapon spawn control was a big part of halo's gameplay.
While Spartan Ops sounds like it could be fun I always hate it when sequels lose things their predessesors had. Not have firefight is just plain stupid and I think it could mean 343 industries is rushing to finish the game on time.