I stopped by the DTW pilot meeting yesterday. The 717 discussion was interesting, a couple of take aways:

They will expand DTW 717 later this year. They don't want deliveries to outpace crew training, or crew training to outpace deliveries

They aren't necessarily going to operate the 717 as a DC-9 replacement. (Ie, hub to nearby out stations and back). The trips sounded a lot like the E175 discussion we had a few pages back.

Other bases beyond DTW, MSP, and ATL are possible, depends on what network wants. Sounded like there could be a NYC base and a west coast base.