I've a scene in mind, as well, bringing Tara's concerns over Willow/ 'Rescuing' Buffy to Xander and by extension, his bringing Anya in (who better to find the Urn, than her?). I have a secondary, behind the scenes villain sketched in my head, but he needs fleshing out. I know that he'll be bringing the motorcycle demons to raid Sunnydale in and then conspiring to use the Hellmouth is some way later on in the 'season'.
Buffybot will be hanging around for a few more episodes at the least and may end up staying for most of 'S6'. I haven't made up my mind about that, yet.
I'm still trying to figure out how to bring Tara's potion, Xander's refusal to drink it and the shakeup over it into the story. (From a time frame pov, it should have been dealt with at the end of 'Rebuilding', actually, and every time I try to deal with it, it just comes out as an awkward aside which isn't appropriate.)
So... that's basically where I'm at. Progressing, slowly, but surely toward posting....
Hugs to all -- Rob