What is the sense?

Fallout 4, Uncharted Drake collection, XBO 1TB............. just, why? why now? why now and not during the E3? :|

I think it's a combination of fighting against leaks and having longer presentation segments of each game.

The developers didn't consider them worthy of E3, or they have more important things to show, so they took some out of the way.

Although, don't really get Fallout 4's announcement date.

Fighting against leaks and rumors

They want to get people Hyped before E3 for their company so everyone is trying to be "the last to be leaked before E3" --->Many Announcements. Sincerly I think what Nintendo did whith the Sakurai Mini-Direct for the 14th June is a little bit smarter, they give something that gets people fangirling but Isn't a brand NEW game right before other companys E3 press conferences and after those there is the actual Nintendo Digital Event. This way people looking back at E3 will think "How did E3 started ? Whith Nintendo SSB Direct, and how did E3 ended ? With Nintendo's Treehouse right after Nintendo's Digital Event" so yeah, it makes feel like there will be a lot of stuff, even if there won't be (but I'm positive it will)

Some are very small announcements that they're trying to get out of the way. I think Fallout is trying to build hype so they can show some at E3 to really prop it up.

Sometimes... You just can't hold it in any longer

theres too many of them.

Because most news gets lost at E3 unless your the biggest news of the day, so devs now come out earlier trying to steal a day of the lime light.