Commodore 64 is an ancient computer that will most likely get trampled by Apple, Intel, and AMD when it comes out. Although, there will probably be a few hardware enthusiasts that will go out and buy one for the sake of having a keepsake.
In any case, I do not see it being a hot seller. Although, I did not think Apple (Macintosh) would be popular either.
Reemergence of the Commodore 64 can be read at http://news.cnet.com/8301-13772_3-20050585-52.html