It wasn't what I expected. In fact, none of the scenes in the preview for 3.0 (that was shown at the end of 2.0) made it into the final product. It seems that the originally planned story for 3.0 was totally modified or something.
A lot of the whole mind fuckery from the original Neon Genesis Evangelion is in this movie, it puts you in the same shoes as Shinji and makes you wonder what the hell is going on, leaving more questions unanswered than ever before.
However what's unlike the original Neon Genesis Evangelion is the story. The first two rebuild movies were fairly similar to the original story of the TV series, 3.0 however embarks on a totally new story, taking us 14 years after the events of the 3rd impact, which is where the whole mind fuckery comes into play I suppose; nobody watching knows what's going on, as it's suddenly and unexpectedly been 14 years since 2.0.
In a way you could say that this movie is a sequel to "The End Of Evangelion" in a sense, being set after the 3rd impact and all.
If anyones interested in downloading, or watching this movie online, I put some links in the Evangleion 3.0 thread