https://github.com/micropython/micropython
https://github.com/micropython/micropython/pull/990
there is also a compiled image available.
wget http://micropython.org/resources/upy.img
python esptool.py --port COM6 write_flash 0x00000000 upy.img
tried a few python bits at 115200 baud, it works.
doesn't seem to do wifi ATM