Yeah because AMD isn't going to be following their single core / different ram type strategy anymore. Cypress and Juniper are the codenames for their next gen chips, with Cypress being the larger and more powerful variant.
I've read some rumors on the beyond 3d forums, that the hd5000 series might be a true Multi-Chip-Module series, which would fit in with the design of the hd4000 series, smaller individual chips.
Of coarse, it is rumors, have to wait and see for more.