Their major focus now is Olympus (2.2).
You're sure about that?
2.0.x releases are only made to fix bugs and security holes; a rather major one was fixed with 2.0.11, so it's very important that you update to that version, as lower versions leave all files on the webserver at risk of being overwritten.
phpBB 2.x, as per the developers' announcement, could well be continued in the future. phpBB 3.0, codename "Olympus," will be the next major release, but phpBB 2.x will still likely be maintained beyond that point.