The R developers are aiming for a release of 2.12.0 sometime this fall. Here's what I would like to do with the OpenMx binary releases when the new version of R is released.
On Windows: the R tools build system will switch from gcc 4.2 to gcc 4.5. The R tools system is not designed to support multiple versions on the same machine. That means we intent to drop support for all versions of R on windows that are less than 2.12. The good news is we'll finally get 64-bit windows releases. Also, we'll need a new compile of libnpsol for gcc 4.5 and windows. And some kind of libnpsol cross compile for 32-bit and 64-bit systems.
On Mac systems: support for R 2.9.x will be dropped. Either upgrade your systems, or install the build tools to compile OpenMx from source. See http://openmx.psyc.virginia.edu/wiki/howto-build-openmx-source-repository.