That's a good point. I didn't think it was unlikely that they'd change band attachment this time, after all they're kept it around a long time so people can't complain about it changing all that much, and if you're upgrading your watch then new straps aren't a huge extra cost. However, I'd forgotten about the Ultra. It would be odd to make the bands on the Ultra, which is still new, legacy already.Apple kept the "band design" even for the Ultra - I'm not buying that they will change any time soon, esp not magnetic.
more important, Apple needs to offer new health functions, better display and such is nice, but not essential.
Also magnets? Really?! Sounds bad enough for normal watches, but utterly ridiculous on the Ultra.
I suppose they could keep the old style straps just for the Ultra, but then they'd be maintaining two lines of straps, which seems unlikely.