I was waiting for snapshots to come up with the new stuff, but it looks like amd64 will be a bit late. Someone is still hiking in the mountains...
A week ago or so, I committed support for some disambiguating filter in pkg_add. This means that you can now simply install packages for ports which have several versions in the tree without having to know the exact version. For instance, pkg_add python%2.7 will install a python from the lang/python/2.7 branch. e.g., stem%branch takes all packages that match stem-* and filters them according to a word in their pkgpath, e.g., you can also use it for, say postfix%stable and other things. This is not really a change, but I've checked where I put %m and stuff support, it works in pkg.conf, it also works in PKG_PATH and on the command-line. This means that you can, for instance, write something like pkg_add http://ftp.fr.openbsd.org/%m/tcl%8.5 and this will grab tcl on the 8.5 branch from the "appropriate" directory of the froggie server, depending on your OpenBSD version and architecture.