The first release candidate for FreeBSD 9.1-RELEASE was put out for i386, amd64, and PowerPC64 with the ISOs being available from the usual FreeBSD FTP mirrors. The FreeBSD.org release announcement has more details on updating to this release for those interested.
While it was released on 23 August, FreeBSD 9.1 RC1 was originally planned for debut on 20 July, which puts this latest FreeBSD release about one month behind schedule. Still to come in over one month's time is a second RC followed by the actual "RELEASE build" two weeks later. Based upon the current delay, we're not likely to see this final build until the end of October or possibly even early November if there's additional setbacks to hamper the free software project. The original release announcement was planned for 19 September. Release engineering information on FreeBSD 9.1 is available from the FreeBSD Wiki.
Meanwhile, at least, there's lots of interesting things coming up for FreeBSD 10.