Bloons Tower Defense 5 release date?

After the great success of Bloons TD 4 and of the Bloons TD 4 Expansion Ninja Kiwi is working on a new Bloons Tower Defense Game. Bloons TD 5 is planned to be released in late 2011.
Rumors say it will be released in November but this is not confirmed by the developers. It won't be easy to top the fantastic Bloons TD 4.
There are huge expectations from fans towards the new game.
If you know something about the upcoming game or heard any rumors post a comment.