It has appeared as of 1AUG14 on the LAX-DFW (HT
airlineroute.net).
It has 16F and 165Y, split between 35 MCE and 130 Y-.
That makes it 8.8% premium class seating, lower than the 738 (10.7%) and the M80 (11.4%), but at least it's higher than the 319 (a measly 6.3%).
No information about the seating pitch, i.e. if it's as crammed as the 319 or it's more like the 738 [although aren't those getting a new row for a crammed 30" pitch]?.
Note that the equipment code is currently "32B", but I believe that to be a mistake as that code is used for the 3-class transcon interior (and I hope to be correct otherwise it will be quite confusing).