Speaking of Guinan, something I've been thinking about that ultimately really isn't very important but will probably result in fan rage and controversy, is the fact that's similar to Brent Spiner returning to play an immortal android, Guinan comes from a species that ages very slowly. Recall that she had not visually aged at all in the 450 years between the old Earth San Francisco parts of Times Arrow and the Enterprise D parts of Times Arrow. Should they explain away the fact that Whoopi Goldberg, and therefore Guinan, has obviously aged just like the rest of us, or should they just ignore it? The last thing I want is for them to use the same CGI techniques that were sketchy enough with Brent Spiner. If they're going to do it, do it right.
Ultimately, it's not something that's going to bother me very much. But I can already see the nerd-rage "it's not my Star Trek /alternate reality" nonsense posts.