I don't think we have a Wiki yet for the ULM, but that is a fantastic idea. I think for now we might want to set up a forum specifically for the ULM redesign project, be it here or on GoMa. Once I get the new GoMa server up and running (should be soon I hope), we can use the new Wiki I have installed on there for the ULM.
Right now we have some basic info on it on the GoMa forums (look under Technical Help) and also in our installation instructions. Pop over to http://www.guildofmaintainers.org and poke around. It might give you a basic brief on what's going on. Otherwise, feel free to ask plenty of questions; we're always willing to help.