The DNN Blog team has announced plans to release an interim 3.6 release to provide some final changes before undertaking the effort to rewrite the code for the version 4.x release.
The 3.6 feature set has not been made official, but current plans are to add support for BlogML, tagging, 301 redirects, and custom RSS URLs.
All effort will be made to minimize scopecreep, since it is a high priority to move forward with 4.x, but we felt that these critical changes needed to happen sooner than could be provided by 4.x.