From what I've garnered from the net this is really something you have to read yourself.
Initally Buffy tries to kill Angel but then something happens, he talks to her about what has been happening and apparently he makes some very valid points.
After that people are talking about a "glowing" or something like that. That there is something actually pulling them together (the secret history thing I'm pressuming) and it apparently glows when then are near.
Also there was talk of their being A Chosen One within a Chosen One or something like that.
I've never spoke about this here but I think Buffy is going to be pregnant by the end of this season. Remember Anywhere but Here when Buffy was warned that she had to "Protect the Prince"? Well she has constantly being referred to as the Queen of the Slayers in this season (i'm they call her Ma'am!) and during that scene in Anywhere But Here there was a cracked red egg hanging over one of the passageways. The giving of a red egg when a child is born is a Chinese custom, it is also the sign of fertility. Plus if Angel can knock Darla up...
What I also get the impression from people's reviews is that Buffy and Angel seem to be under some sort of influence when they eventually kiss, like they just change out of nowhere.
Lots have people have said that it feels that Angel is smooth talking Buffy, they aren't quite sure to trust him. Also, when Buffy tells Angel that she got her power from the dead Slayers he as "Did Willow tell you that?", which sort of implied that Willow was lying.
Basically we have been left with mountains of question, which I suppose we knew would be the case.
I'm going to withold my judgement until the season is done but honestly, if there was no magic involved I'm kinda heartbroken that A) it's actually Angel and B) Buffy just fell back into his arms.
