The NDA/media embargo ended few hours ago so footage and previews from the ESA event started coming in, plus some things posted by the devs like the pre-release notes:
https://forum.kerbalspaceprogram.co...-program-2-pre-release-notes/#comment-4233618
The as tl;dr as I can make it version is: collision/buoyancy physics look buggy/janky (parts sinking into the ground, kerbals walking above surface (ditto for rover wheels hovering), parts breakdancing due to wonky collision physics, water acting like), performance for a 100-ish part craft with 12 (I think ) engines firing at the same time was crap on a RTX 4080 (it had to be sped up 8x in the video by Everyday Shill-o-naut to look smooth, but this is also with all setting on high), no re-entry heat on EA release, various minor UI bugs (pause/unpause spam, trajectory after SOI change around new parent body not drawing), no autostrut and rockets as wobbly as in KSP1, trees/rocks have collisions disabled.
However the sound design and some other presentation stuff is quite impressive, they added kerbal mission radio chatter for staging, there's a countdown with a call out from mission control that can be skipped, tutorial voice over is quite professional quality-wise even if very cartoony/perky and aimed at kids judging by the style, each celestial body seems to have its own musical a theme or at least the planets do, there's also some nice QoL stuff like rendering the sphere of influence around other bodies as a transparent sphere or marking where your acceleration will end on the orbit (plus timewarp during acceleration is already in for EA), the delta-v map is available inside the game in the VAB, the sea has actual polygonal waves now, the VAB has orthographic projection (blueprint mode) available from any of the 6 right angle directions for easy part alignement, rover wheels don't break from speed as easily (ex. jet cars are viable with rover wheels), procedural wings can have integrated control surfaces (there are 3 types, just a wing, wing+control surface and procedural canard), active pause allowing you to plan nodes/check the orbit.
The build was 2 days old during the event, and that took place 10 days ago, so apart from some minor QoL related bugs I doubt they'll fix much. Also it seems the PC they provided to streamers managed to crash for Scott Manley as he lost a lot of his footage somehow, unfortunately.
This guy has a decent short one that's to the point regarding performance while also showing a lot of the stuff, although his voice is kind of hard to take seriously: