Back long before the BlackBerry Curve 9220 became an officially released device, it and the 9320 showed up in some UAProf documents. At the time, we noted that it was part of a series of Curves that were to be released. The "Jazz Series" as it was called which contained three new devices in total. Davis, Armstrong and Wynton were the codenames for them and back then, one device was missing off the list. The BlackBerry Curve 9310.
Most recently, pre-release OS leaks turned up for the Curve 9310 but there still was no documentation to go along with it. Though, now it looks like RIM is getting closer to release presumably on Verizon due to the fact they've now uploaded the UAProf to their servers with the latest update happening on April 25th.
As noted in the UAProf, it will be running OS 7.1, have a 320x240 display and be compatible with Verizons network. Unless of course its intended to be released to an emerging market with CDMA support which could be possible as well. Either way, the device hasn't appeared on camera yet but I'll go out on a limb and say it's not the device I'm looking for.