I'll get anything by Keith Baker that he wants to put out for the setting. That said, I want new stuff by Keith Baker not stuff that I already have on my shelf for 3rd edition. Mechanics aren't as important to me as ideas these days (especially since the group that will really want to play Eberron will really not want to play 5e so I'll be converting everything to 13th Age anyway - so the 5e conversion material of existing 3e work doesn't help me much). I'm glad its out there, but more because I'm looking forward to seeing what comes next not because of the book itself (though when its available POD I'll be buying it anyway because of course I will).
From other authors I want adventures. Big or small it doesn't matter - I need both types.
The rest of it - not so much for myself. Even setting expansion material - every continent got a sourcebook for 3e and I have them all, so I don't need more of that. I could use adventures set in the various locations though - including the planes. And if those adventures detail a small region of those continents/planes then that's great and I'll take it.
From other authors I want adventures. Big or small it doesn't matter - I need both types.
The rest of it - not so much for myself. Even setting expansion material - every continent got a sourcebook for 3e and I have them all, so I don't need more of that. I could use adventures set in the various locations though - including the planes. And if those adventures detail a small region of those continents/planes then that's great and I'll take it.