Only one beta is needed to change the status of Slackware 13.1 into Release Candidate 1. As usual, Slackware traditionally don't have too much RC release, so Pat has called for last testing and bug report session before he released Slackware 13.1 as a final release.
With the status of RC1, the base toolchain (kernels, compilers, glibc) are freezed without further changes unless a critical situation arises. Most of the packages are getting upgraded to the latest stable version and the root's email has been updated to reflect Slackware 13.1 is coming
Well, unless major things happened, i believe Slackware 13.1 will be released by the end of this month or even start of June 2010
This batch of update also include one security update: kdenetwork.