(Edit: I should probably mention that I don't follow or watch E3, so I'm not hyped either way but the following is what I'd hope for, but actually expect if I did.)
I wish for:
1. Announcements of games that will actually come out soon. If it is years away, then just don't bother.
2. Said games from above to be good.
3. Bravely Default 3
4. Announcement of Final Fantasy XVI headed by either Yoshi-P, Hiroyuki Ito, or outsourced/co-developed with Mistwalker/Hironobu Sakaguchi
5. FFVIIr to NOT, absolutely not, be anything gameplay-wise like FFVII. I want depth and control over my characters. FFVII original was easy, but there was a lot of depth to the Materia system if you went all in with it.
6. A new Mana game.
7. News on that FFXI portable version/remake that's been dark for so long. Bonus would be if it heads to Switch also, and that the PC gets the graphic overhaul.
8. Kingdom Hearts 1 and 2 for Switch and PC, and KH3 for PC.
9. Dragon Quest past games coming to PC. I would imagine that if this happens, the first 6 games will be the mobile and DS releases (I'm okay with that), and 7 and 8 would be some manner of the 3DS versions. 9 would likely be done similar to FFIII and FFIV on PC where everything is uprezzed and smoothed out from the DS. 10.....well I stopped hoping for that one quite some time ago.
What I actually expect:
1. More information and demonstrations on FFXIV Shadowbringers. (I'm cool with this, FFXIV is great)
2. Stuff from their western studios probably. (Somewhat indifferent here, but not saying anything bad about the games themselves)
3. FFVIIr information in some capacity. Thinking a trailer and not much else, but then again, FFXV and KH3 are out of the way so there's a good chance of there being more since I'd assume there is more focus on it.
4. Mobile stuff. (Don't have a problem with games on phones, I just don't typically use my phone as such. I am not a smartphone game hater by any means.)
5. Maybe.....maybe Bravely Default 1 and 2 going to Switch. I think I once read about that being a possibility, or a consideration some time ago, but I could be mis-remembering and thinking of something else.
6. And last but not least as a wildcard: Final Fantasy XVI sliver of information. Unlike the above in the "wish" category, this might be nothing more than confirmation that it exists, is in development, possibly the logo and an image or two and that would likely be about it.