If the latest leaked images are to be believed, the Nokia C6 comes in slider form and looks fairly similar to the Nokia 5230. Looks genuine, but you never can tell for sure. Hopefully Nokia will confirm or deny soon so we can put it to rest either way.
It also looks similar to the N97 and N97 Mini, but the sliding QWERTY keyboard is parallel to the screen, which is much nicer. Looks like the C6 also has a trackpad that you won’t really need with the full touchscreen display.
If real, it should arrive this summer.