As you might have heard; APB is going to be re-released, as APB Reloaded. GamersFirst bought the rights and is developing it now, and it's currently in closed beta. GF made the game F2P, so there might just be much more players than in the old version.
They sent beta keys to people that registered their e-mail on the site, but they recently released 5000 new keys. I have heard that it's going to be released this summer for anyone to play.