Final Fantasy XV: An Indignant Boy Eating Food, will not have any new developments at E3 this year. Neither will Kingdom Hearts 3.
When asked point blank by Famitsu if these will show at E3, Square's Shinji Hashimoto stated, "We are are working diligently on KH3, but I think releasing new information will still take some time. We included a small part regarding the story of KH3 In the new trailer KH 2.5 prepared for E3 2014, so please check that out.”
On FFXV, Hashimoto replied, "First I’d like to say that development for FFXV is going well. Internally, we try to ascertain the best timing for revealing new information about FFXV to the fans. So when we were going over our promotion plans, we judged that this year’s E3 would not be the best time to exhibit information about FFXV."
That's not to say that Square Enix isn't showing a lot though, as tons of big Final Fantasy XIV news is expected to drop, alongside of possible new announcements. I'll keep my fingers crossed.
Shinji Hasimoto Interview [Sqex.info]