Why are all the e3 trailers released before e3 ?

[loadedstatement]

markers said:
to hype you up for E3, im sure they have other new trailers to show as well.

This.  And they may not have other trailers. But, for Bayonetta for example.  A trailer came out yesterday.  But I will be attending a behind closed doors demo of the game.  So the trailer may still be shown, but there will be even more info about the game at E3.