Question for the Developers

I've been scopin out some other forums and there has been talk about a feature called a "download mesh". It's basically where a source gives you the location of other sources, which are probably out of your search horizon, to download the same file from. You basically get more sources to swarm from. Also, does Limewire still plan to incorporate HUGE/hashes? Will most systems be able to handle the hashing of files using Java?