There's been fairly organised efforts so far hunting for anything worth flying at speed, and sadly it appears as tho the new generation has reduced the elevation variation and range down to something that's more aligned for the foot-based play rather than flight now.
In comparison to Horizons, almost all surface features are now significantly more shallow, much of the 'noise' in the system that led to small spike-type features providing obstacles or turns has been removed, terrain edges have been smoothed, and the size of areas also reduced.
Pomeche 2C received special attention and was 'handcrafted' as a gesture to 'canyon racing', and whilst canyons are still pretty high (much higher than every other planet) - they're also far too wide, straight and without any internal complexity to offer any challenge at all.
On this basis - that everything so far has been flattened (where before there was much variety and
thousands of good sites just in the bubble), and even the
specifically handcrafted single example isn't fit for the purpose they handcrafted it for - it's looking very bleak indeed.
It's not a racing / hooning game though. There's still the option for space-based racing around stations & installations (if they also fix the NPC spawn bugs there and janky framerates). Surface-based emergent gameplay in the form of challenging flight appears gone though in EDO.
Edit: See also:
https://forums.frontier.co.uk/threads/odyssey-horizons-comparison-thread.575895/