I'd be sold if they included the Horde mode. I haven't seen ANY mention of that, and last night I played the Beta with Team Deathmatch and I was VERY quickly reminded why I don't have many fond memories of playing TDM on GoW.
I'd like to see Microsoft release all of their exclusives on PC but that would really make me regret buying my Xbox One.
Funny you mention that..
For some reason Fallout 4 on PC will run at 30 FPS, or at least until Modders get a hold of it..
http://www.gamespot.com/articles/fallout-4-will-run-1080p-30fps-on-ps4-xbox-one-pc/1100-6428362/
Edit: Nevermind, PCGMR still intact..
Modders have basically recreated Splatoon in Team Fortress 2.
TF2 is getting a big update. Some are worried though that it's mainly just a watered down Counter Strike
http://steamed.kotaku.com/team-fortress-2-is-becoming-more-like-counter-strike-1715467393