Ah, I wasn't aware that they already switched sides since last year. Which new game that's getting exclusive content on the 360? Dead Space 3 with "Better with Kinect" ads I'm guessing.
Yeah, them not showing a demo at the PS meeting was a clear indicator of what's happening.
I'm not saying that you're wrong, but I do have an alternative theory - that EA would rather wait until it can reveal its games for all platforms. If it showed BF4 the other night, it would have to say PS4, PS3, 360 and PC, and despite them later saying next Xbox too, the damage is done - look at how many people thought Destiny wasnt coming to PS4 because of the leak, even after they confirmed it.
EA's way is working is that the day they announce the game they release a detailed bio, shots, video, boxart, it goes up for preorder etc. Announcing when they still can't speak about one of the platforms will limit that.
Yes, it's entirely possible that they're in bed with Microsoft, but it's also possible they're just waiting until the last platform they're targeting is public. That could still mean it gets shown at the Xbox event, just that the press release afterwards will also mention PS4. When Watch Dogs got show, the press release only mentioned PS4 and Wii U, but does anyone really think it's not coming to Xbox next?