I watched the first half of a webinar on micropython on Monday. I bailed when I found that it required a 165K "kernel" installed in the target and 16K of SRAM. micropython.org indicates on its home page that a minimum of 256K of flash and 16K of ram is needed.
The presenter also indicated that micropython programs are run-time interpreted.
Does not sound like the developers have much interest in 8/16 bit world.