Hmm, haven't watched Nintendo's conference and didn't watch Konami's conference, but...
Microsoft:
+Halo 4 was interesting with the new animations and the cinematics.
+Splinter Cell: Blacklist was also interesting to see, although it seems like it's a polished Conviction.
=Media stuff is cool, but not interested.
=Call of Duty trailer: it's Call of Duty, but I'd be lying if I said I wasn't interested with the setting
EA:
=MoH: Warfighter looks cool, but eh, it's another modern military shooter.
-I guess everything else about it, didn't really interest me at all.
Ubisoft:
+Assassin's Creed III is shaping up to be good, might actually buy it when it comes out. The PS Vita exclusive and cross-play is also interesting.
+watch_dogs caught my interest. As for the shooting elements, eh.
+Far Cry 3 looks good, and as for the hallucination, well...the first few games had mutants, so, par for the course?
+Rayman interested me because of how the Wii U was used.
Sony:
+Beyond seems cool: Second Sight + Heavy Rain?
+The Last of Us was also interesting: lack of ammo, health bar that doesn't regenerate and having to find medkits, making items on the fly. Funny I was watching the trailer on TV, so there were a lot of bleeps going around.
=Not much Vita stuff, asides from the PS1 Classics on the Vita, which I guess is awesome.
The things I wasn't interested in, I tuned out.