The December snapshot has been tagged. Binaries will be uploaded soon. This snapshot will include support for SSE2 for machines that have SSE2. Otherwise the standard x87 support will be used.
Mac OS X will support both SSE2 and x87 for now, but this will probably change in the near future since Mac OS X always has SSE2 available. Also there may be an issue with FreeBSD where arithmetic exceptions on x87 may not be working quite right. Arithmetic exceptions appear to be working correctly with SSE2. This issue is a regression from the previous snapshot. Hopefully, this will be fixed by the next snapshot. The distributions will be about twice as large as previously because they contain two lisp core files: one for x87 and one for sse2. Hope this isn't a problem for people. Ray