The release of FreeBSD 8.1 RC1 is off by a week than what was originally planned in their 8.1 schedule, which may put off RC2 by a week and also their official release. Building the official FreeBSD 8.1 release was expected to be done on the 9th of July and then an announcement some point later. FreeBSD 8.1 RC2 was expected to take place on the 25th of June.
Details on FreeBSD 8.1 RC1 can be found within the mailing list announcement.
We may end up doing FreeBSD 8.1 benchmarks to see how its performance compares to that of FreeBSD 8.0 and other Linux/Unix operating systems. We still have up through our PC-BSD 8.0 vs. Kubuntu 9.10 benchmarks and FreeBSD 8.0 vs. Linux and OpenSolaris tests along with a wider OS comparison.