WordPress MU, the branch of WordPress that runs the popular WordPress.com “instant blog” site is being discontinued.
Matt Mullenweg announced at WordCamp San Francisco that the multi-blog capabilities of WPMU would be merged with the main WordPress core, a la Movable Type.
The two codebases’ merging will hopefully unify the project a bit more. It’s always stuck me as a bit odd the way WPMU is so separate from the main project, with slower development and minimal documentation.
I only hope that this is done carefully so that the majority of WordPress users (who are running single-blog setups) won’t be confused or inconvenienced in any way.
Thanks to @wptavern for bringing this to my attention.