When will there be a 64-bit Limewire 5.x version available for Vista?

Currently on my brand new Intel Quad Core Limewire slams one of my cores to the brim! I would much rather it break it up and spread the threads around to other cores for better performance.

My favorite use for this would be to select which cores Limewire has access to, thereby ensuring some are saved for other processes, but using all cores when i really want better limewire performance. I'm sure im not the first to think of this. What is the status of x64 Limewire development? Thanks.