Had my preview yesterday. Spinny Space Mountain is what it is. Not sure why anyone is trying to sell it as anything else. It's not that different from say... DL's Space Mountain/Hyperspace Mountain.. in the fact that it would be REALLY easy for them to add different programming for this for whatever occasion (but likely won't). The projections made it feel like a layover, which is what I feared.
The queue was great, preshows were fantastic although AAs were missed. Loved how grandiose a lot of moments felt leading up to the ride. Chalk me up to another rider who experienced motion sickness on this one. Had the ride been a few seconds longer, it would've been over for me.
Overall, a great experience overall but no, not my favorite new ride or anything. I was offered a repeat ride as we child swapped and I politely said no please thank you. Only one ride per park visit for me.
Also, I had I Ran (So Far Away) on this ride. AWESOME.