I just started looking at these guys and wrote some preliminary code yesterday (on paper, haven't gotten around to testing it). Anybody else playing with them?
Here's the datasheet for the WS2812B, which is the latest revision of the chip. FWIW, the 2812 is an RGB LED with the WS2811 LED driver chip onboard the LED itself.
Assuming an 8MHz internal oscillator AVR, it appears that I can come up with timing well within specs, so I expect it would work just fine. I'll post my code when I've actually compiled/assembled it, but in the meantime I was wondering if anybody else was working with these things.
So far it looks like (using an asm function) I can hit 6/4 (for a 1) or 4/6 (for a 0) clocks for the first 7 bits, while on the 8th I can hit 6/4 and 4/7.