I have never been right on these so you can rule some of the below out, but here's some 10th anniversary ideas that haven't really come up elsewhere that feel like a decent fit for this kind of deal. My gut tells me we're going to get a lot of live albums/recordings both from 2021 and before, a lot of classics, and not a ton of new/fresh stuff with the delays.
Various – Les Misérables (Highlights From The Original Motion Picture Soundtrack)
The arguments for this are pretty good. RSD has been pretty heavy on in-demand movie soundtracks for the last few runs, it is coming up on its 10th film anniversary and it has never been pressed as far as I can see. Given the sheer amount of money the film made and the bit of difficulty in finding other Les Mis OSTs, this feels like it would do pretty well
Various - Perks of Being a Wallflower OST
This has all the markings of an RSD release. Obscene secondary market prices with a nostalgic fanbase who wants it out there for a cult film that's grown over time.
Carly Rae Jepsen - Kiss
I think she'd do more of a webstore deal and the rights to this seem to be super iffy, but a 10th anniversary of Call Me Maybe, with how she handled Emotion's 5 year, feels like a great fit.
Gotye - Making Mirrors
Speaking of obscenely overpriced limited releases that had a HUGE hit ten years ago, this feels like the kind of album that would make a small subsection of folks really, really ahppy.
Miguel - Kaleidoscope Dream
This one isn't as hard to find as the above two but it's one of the best albums of that year and hasn't seen much in terms of a repress since its initial release.