"Based on William Blatty's novel"
Just watched the trailer for this and I'm frankly confused. If they based this off of the novel, it was done extremely loosely. The 1973 film is very, very close to the source novel. This looks more like your run-of-the-mill possession horror with priest v. possessed girl (a trend the '73 film started), which is a major disappointment.
I'll give it a shot when it comes out, but the trailer didn't make much of an impression, and the "based on William Blatty's novel" claim is a bit misleading.