Famitsu is covering Final Fantasy XIII-2 yet again this week. Most of the stuff covered in the article has already been reported, though they did report on the length of the game, as well as bonuses for your Final Fantasy XIII save data.
Final Fantasy XIII-2 is shorter than the first game, though it still clocks in at around the same amount of time as older Final Fantasy titles. The game will reportedly last around 30-40 hours on your first playthrough. XIII-2 does, however, is about equal in volume to Final Fantasy XIII.
Also, if you have a save data from the first game, you will be rewarded. Famitsu is reporting that you will receive some sort of in-game wallpaper, as well as a wallpaper image (possibly images).