Since Shin Megami Tensei: Devil Survivor 2 is due in stores this week, Atlus Japan is beginning to talk about Devil Survivor Overclocked. The Nintendo 3DS remake, as mentioned before, has 20,000 lines of voice acting.
New demons upped the count to over 150 and there are over 200 skills to learn. While the original game only had one save file (two if you count the autosave slot), Devil Survivor Overclocked has multiple save files and different difficulty levels.
Atlus also created a new Survivor Award system, which unlocks additional content if you can fulfill certain requirements.
Shin Megami Tensei: Devil Survivor Overclocked is slated for release on August 23 in North America.