Yep. Type "xbox series x unboxing" on youtube there are bunch of new videos today.. I would post you a video from a greek youtuber, but it is obviously in greeek without subs. He compares on the same table, Xbox series X and S with PS5, in size comparsion and all of them with Xbox One and PS4 pro and slim. He also did a speed test in loading times from boot-up to in game , series X vs ONE.
All in all they said what it is known until now. 60 FPS 1080p for S, 4K native for series X, some games may have 120HZ, raytracing etc, but the games have better performance take a cut in graphics quality. And that series X (the bigger one) is cooler than Series S, it works around 45 degrees Celcius. Also some games, i think from gamepass that are backwards compatible , have an automatic transition to HDR, this is from console optimisation, not from games, but it is very good algorythm and it upgrades it really decent.
Also it is DOLBY-ATMOS able, this thing about sound, i do not know what is this, i am too old-fart!!
Also this extra 1 TB card memory-expansion costs almost 200,00€ in Greece, and in series S which is 500GB and 350GB after the system data requirement, it is necessary.
The D-pad is smaller, reviewers said they will stay with Elite 2, also said that old controllers are compatible with new console, same for new controller, it is compatible with old consoles.