plans for 64bit support

Hi all, Now that Leopard is out and already at 10.5.1 will macports be supporting 64bit libraries? It's just I need 64bit in my octave installation. I pull my octave from octave.org's cvs, but it needs quite a lot of support libraries. From what I gather it should be possible on Leopard to build fat libraries, i.e. ones that contain 64 and 32 bit code (i think it works using -arch x84_64 -arch i686 as gcc flags). Or will this be left to the separate ports? Daniel Oberhoff