The R core group has quickly followed up with a patch to R version 3. Announced yesterday, R 3.0.1 (code name: "Good Sport") improves serialization performance with big objects, improves reliability for parallel programming and fixes a few minor bugs. (You can find the complete list of changes in the NEWS file.) The source distribution and Windows and Linux binaries are available for download now from your local mirror, and the Mac binary will follow soon.
The R core group continues to develop R version 3, and more patches can be expected over the coming year. Revolution R Enterprise will update to inclde R version 3 in late 2013.
R-announce: R 3.0.1 is released