Not sure if Nokia can pull it off, but I would try to bring a family of devices to market, not single ones. Each device runs Meego, and a similar (if not identical) UI:

11/2010: N9 (smartphone, no keyboard, 4 inch screen, Meego)
01/2011: N9 Tablet (Tablet, 7 inch screen Meego)
03/2011: N9k (smartphone, keyboard, 4 inch screen)
05/2011: N9 mini (3 inch screen)

Nokia would have a devices with similar features across a wide range of screen sizes, would stay in the tech news for a year, and could really gain momentum re developers if the family proves successful.