They are using my airplane to get an STC valid for the entire turbine fleet-- possibly the pistons as well.
They are saying 90 days, so hopefully early December. They've certified the 3100 in some other airplanes already (King Air series, I believe) so it should be fairly straightforward. And most of the installation (servos, wiring) is the same as the 2100, which Eagle Creek has done a bunch of.