A brand new trailer for Shin Megami Tensei IV was shown at the third-party exclusive Nintendo direct presentation this morning. Satoru Iwata explained that there will be over 400 different types of demons.
There are tons of returning demons such as Jack Frost and many of the demons featured in devil summoner and the persona series.
Shin Megami Tensei IV will be releasing in Japan on May 23rd. It is unknown when it will make it outside of Japan at this time.