Some people are streaming KSP 1.0 on twitch. (I thought there was an NDA?)
Anyway, they were pretty bad so I stopped watching. I did get a peek at the new tech tree though. Looks like there's a lot more nodes to unlock now.
Some vids are up on youtube. One feature that was not mentioned before, launches kicking up dust (hopefully rovers also do it). Obligatory Scott Manley vid:
I also noticed one of the plane cockpits has a fighter-like HUD in IVA (the inline cockpit I think).
New parts include airbrakes, yuseful since the souposphere's demise means you can go way faster at low altitude. Ailerons can be set to work as airbrakes or flaps as well.
Resource scanning has two different display modes scanlines and the dot matrix.
Aerodynamic stress is a thing.
Tourism contracts can have multiple tourists with each tourist demanding to visit something different (ones wants just orbit, the other dude a mun flyby while the 3rd wants mun+minmus).
ISRU parts are somewhere near the end of the tech tree on the SCIENCE!!! branches.
Merge option under craft loading in editors, basically an alternative to saving subassemblies and just importing whole crafts.
Fairings have mass and cost funds depending on how big you make them. Also hovering over the fairings triggers exploded view of the fairings to reveal the contents.
I am intrigued by what parts are under the "angry robot" node icon.
New wings also allow you to recreate the reich flying wing jet bomber
Service bays don't have that centrepiece shown on the screenshots, so you can just stick a rover inside with no problem.
LV-Ns finally run on liquid fuel only, as they should.
Parachutes now deploy more gradually.