It's from Digitimes so take with a pound of salt:
http://www.digitimes.com/news/a20120220PB200.html
Allegedly eInk is to start shipping 6in Triton Eink screens to Amazon in March.
Peaking at 3 million a month at some point down the road.
March screen deliveries means May-June deliveries.
I won't hold my breath but it's worth keeping an eye out.