According to both Gamestop and Amazon, The 3rd Birthday is now set for March 29th, and the prices has gone down by ten dollars. (This is probably due to the fact that Japan didn't seem to take too well to it.)
Also, Amazon has a page set for the guide already, it's called Parasite Eve: The 3rd Birthday Signature Series Guide and is being done by a common guide name, Brandy Games. It will be 356 pages and will be released the same day as the game. There is no cover art or anything for it yet, and Amazon seems to be the only one with any news on the guide.