SPOILERS
willow will cast a spell to bring buffy back

buffybot takes care of dawn while buffy is gone
A vampire injures Buffybot and discovers she's full of wires and computer chips. The vamp escapes and lets a bunch of demon bikers know that Sunnydale is now slayer-free. The bikers head into town to plunder.

Giles will be in and out of the show this season.

Buffy and Spike become more than friends before Thanksgiving.
buffy and spike this season will share there first real passionate kiss(this happens on november 6)!

Its strongly implied that Buffy was happier in the afterlife and intends to kill herself to get back.
A midseason wedding is planned for Xander and Anya, but when an anxious Xander gets cold feet on wedding day, Anya turns back into a vengeance demon and seeks out the boy who stood her up. But even in demon-mode Anya realizes she can’t hurt her little butt-monkey -- and reverts back to human.
Episode 6 will be a special all musical/dance episode