If your keeping track I have speculated on Densil Theobald of Trinidad (my suggestion), Jacek Bak of Poland (linked through Mo's New York days and theories floating on other blogs), Dwight Yorke of Trinidad (Mo's visit to Sunderland + GOL TV report), and now Martin Andresen (fits description). That said I do not have confirmation about any of these players.
While the David Beckham signing coupled with the talk about Ronaldo, Edgar Davids and even Robbie Fowler has created new levels of expectation from fans unfamiliar with MLS, I caution you as a long time follower of this league to be realistic in your expectations. Sir Mo has made it clear that the signing won't be a big name, and this league can be won without big name players on a roster.
History shows Canadians on an MLS roster however can help teams toward MLS Cup success - Alex Bunbury (KC Wizards), Geoff Aunger (DCU), Pat Onstad (San Jose/Houston), Dwayne De Rosario (San Jose/Houston), and Adrian Serioux (Houston) have all won MLS Cup.