It honestly looks like there are no major codebase changes. It seems like it's Windows 10 with a beta 1 Fluent Design. This is what Windows 10 should've been but instead they left it half complete. I seriously hope Microsoft doesn't consider this final and releases a near final Windows 11 next week. I really hope this is the beginning.
Since there seems to be almost no actual incompatibilities, I'll be installing this on my main PC