This article on Kyoto (Translated Page) features an interview of Hisashi Owada, who is apparently a president of some division within Canon. When asked about Canon DSLR strategy, Owada said:

We will launch a strong product. Intermediate camera “EOS 5D” there will be increased durability and the subsequent pixel models listed. At the same price, we will launch better products.

Granted, that’s Google’s translation, but I think we get the gist from it. It sounds like we’ll be seeing something in between the current 5D and the 1 series cameras.

For what it’s worth, here’s another translation:

We will launch powerful products. A new version of the middle range 5D will be launched with more pixels and enhanced reliability in the market. This will be the best of the DSLRs in the same price. (Source)

More on the 5D Mark II (or whatever it’s called) on this page. Stay tuned for the latest.