A brand new countdown clock on the Sony website has an interesting background, suggesting a brand new Patapon-something could be on the way. Naturally the clock will reach zero sometime during the duration of E3, at which point it can only be imagined that the whatever-it-is will be announced.
The Patapon series has so far been exclusive to the Playstation Portable, and is a series that has generally received good reviews. A third game wouldn't be entirely out there, and it'll be interesting to see what changes (if any) are made. Either way, it's certainly nice to see such an enjoyable series alive and well.
Stay tuned for more information regarding the countdown clock, Patapon, and of course E3.
Source: Playstation Japan