What do you expect from College of Spirits when "Ravenloft: The Horror Within" comes out?
Honestly, it might not be my most anticipated subclass in the pack, but it's the most intriguing for me. I think the subclass has seen the most controversy in UA, losing two really definitive features. One of which is unique randomness, which you can kind of control because you need to roll first and only then use it at the right moment (which I think is very drastic to lose), and the second of which is cheap version of Lore Bard secrets. In exchange it gains a buffed Spirit Guardian and free casting of it, that is really strong.
Are you expecting something like what happened with Banneret, when all the changes are removed and perhaps a lil' tweaking of wording (so that healing buff would simply works now)? Or you're expecting that UA bard will remain almost unchanged (he for sure looks like a “new generation” subclass, so to speak).
I personally have strong opinion only for randomness. I don't mind losing the spells, although it seems that thematically College of Spirit should be on par with casting Commune and Augury to Knowledge Domain and Diviner.