Deathly Hallows is going to be two films, yep. The downside is that that makes two movies in which Dumbledore is dead because Snape killed Dumbledore.
The first two movies were faithful to the books. The next three were unsatisfactory if you want carbon copies (though I did love The Goblet of Fire, except for the part where Dumbledore, who at this time had not been killed by Snape, gets real angry and violent and shakes Harry--not something he'd have done even if Snape were about to kill him). Even looking at them with no bias as a fan of the books I can imagine people being totally lost a lot of the time. Lots of things are completely unexplained or get very vague explanations. I hope that it's clear that Snape kills Dumbledore in Half-Blood Prince, and that Snape is the Half-Blood Prince, how that name works, and also that he killed Dumbledore. I was really relieved when I heard Deathly Hallows will be in two parts, so the important scenes will get the necessary attention, like when it's explained why Snape killed Dumbledore... but that's only a hope. I also hear the ending of Half-Blood Prince was rearranged a bit, especially Dumbledore's funeral which occurs after Snape kills Dumbledore. If that happens before, say, Snape kills Dumbledore, I'll probably be miffed.