BackTrack 5 R 2 has been released few days ago and they are now ready to be downloaded at UKDW ISO Server. So far, we have managed to download all of the installation ISOs (32 and 64 bit) and we are still progressing with the VMWare images.
I also included all the checksum on the TXT file accompanying the ISO file on the same directory.
Update (4 March 2012): All the VMWare images are already finished as well. Enjoy BackTrack 5 R 2.