From the post:
We are pleased to announce the first release candidate for Riak 1.0.0 is now available.
The packages are available on our downloads page: http://downloads.basho.com/riak/riak-1.0.0rc1/
As a release candidate, we consider this to be a functionally complete representation of Riak 1.0.0. From now until the 1.0.0 release, only critical bug fixes will be merged into the repository. We would like to thank everyone who took the time to download, install, and run the pre-releases. The Riak community has always been one of the great strengths of Riak, and this release period has been no different with feedback and bug reports we’ve been given.
Cool!