Here in Maemo Software R&D in Nokia, we developed Maemo 5 initially on N810 hardware until the hardware adaptation to the new hardware was working. Now we are working mostly on the new hardware with OMAP3 processor.

The SDK will be working initially, as correctly suggested here, in the Scratchbox environment. Because we are developing Maemo 5 with an UI and application framework that uses Clutter-based hardware graphics acceleration, it is not trivial to make the same code run on devices that do not have hardware-based graphics acceleration. In addition, if one does not have a HSPA modem available, several use cases that are visible in the UI will simply not work. And furthermore, if one does not have a high definition camera, then even more features will be rather useless. Not to mention that Maemo 5 is optimized for OMAP3 processor power. How the software will feel if one runs it on OMAP2 processor is something we don't know yet as long Maemo 5 itself is not feature complete yet, but it is something we are investigating.

By the way, we are on schedule with delivering our early SDK still this year. Stay tuned.