According to the official Twitter, an OVA of Accel World
was announced to be released on September 13th. It will be bundled with the simulation & action game "Accel World -Ginyoku no Kakusei-" for Playstation Portable and Playstation 3.
Accel World game official website
Trailer of the game
The release of the second game has already been announced. Its release date hasn't been fixed yet.
Source: Accel World official Twitter account
Accel World OVA