If certain trailers and teaser sites are to be believed, there may be something related to Persona 4 in the works, and we may know more in less than two days.
A mysterious live-action trailer circulating through the web shows a bunch of people talking about the rumored "Mayonaka TV". Persona 4 fans may know that "Mayonaka TV" is the Japanese name for the "Midnight Channel", the key story element in Persona 4.
The trailer ends with a web address leading to mayonaka-tv.jp, a teaser site with a shade under two days left on a countdown clock. Incidentally, the clock runs out on April 11th 2011 (Japan time), which is the same day that Persona 4 "begins".