I find it kinda weird they would show off a PlayStation 4 version that appeared to be having stability problems and crashed a lot, but still didn't show off the Xbox One version.
They chose to show a PS4 version that simply wasn't running well, but chose not to show the Xbox One version for whatever reasons. Obviously, those reasons weren't stability issues, since the PS4 obviously had that.
Is there some backroom deal between EA, Microsoft and Sony? Sony shows off EA Titles, Microsoft shows off EA Sports titles? I guess that wouldn't make sense because we have seen Battlefield on Xbox One and we have seen Fifa on PS4. Who knows what is going on anymore.
I think people are reading too much into the XB1 not being there. EA's goal was to show off the game, not it's performance on every system. There's no point in them bringing both of the consoles.