The Q100s are rebadged DH8s. The Q200/300 are DH8-200/300 with Noise Suppression, still with PW127s. The Q400 has NVS, PW150s and 360kts quoted max speed. see
www.q400.com
BBD will apparently firm an LOI for another 10 tomorrow.
http://www.pprune.org/forums/showthread.php?t=209246