Anya most likely survived. When she fell there was a lot of time between that and the borab, I'm sure someone came to help her, or that is what I expect, I highly doubt they'd kill her, she seems important.
I highly doubt Rolo is going to betray, maybe be hurt, but he does save Lelouch in a later episode according to the summaries.
I believe there is 1 Glaston Knight alive now...
I also believe Nunally and Sayoko are alive, we don't know how far along the plane was by the time the Freija went off, they could have pulled something.
Any and all hopes for my GinoxKallen are pretty much gone, unless that was playful banter, which is not the vibe I got.
And actually, if anything, this gives Cornelia more of a reason to join the Black Knights, she doesn't know that Guilford got Geassed, and from her POV it looks like Britannia essentially killed him.
On Rolo: While I did defend him, I do, and did, understand he is a psycho, I just wanted to believe he hadn't completely lost it, which he has. Though, in theory, it wasn't a bad plan to eliminate Nunally, Lelouch himself said he would be done with Rolo after it, so his actions/thinking was kind of jusitfied, if only ever so slightly.
And you know, the 'Live' Geass may have triggered the action, but Suzaku was the one who decided to equip it essentially, nobody had the power/authority to make him, so he made the choice.