There is a new official WordPress theme directory over at the wordpress.org site. Naturally, it is hosted under the “extend” tab, where we already go to find our plugins, so it is a natural addition. As of now, there are only 3 themes available, but since this is brand new, you can expect more to be submitted and added soon enough.
If you would like your theme hosted in the official directory, you need to GPL it, make sure that there are no paid links or similar in it, and fill out the other (not too evil) requirements.
As of now, there are no API available, for version checking like we’ve got with plugins hosted in the extend plugin directory, but this is supposed to be added in the future.
This is a good thing, since the old themes directory is pretty much defunct. A central spot is also good, although the GPL limit will be keeping some themes out of the official limelight. There will be no paid themes either, which will turn off a lot of theme developers.
Check out the new themes directory, and tell me if this is a good idea or not!