There is little to no news regarding new bases. The general feeling now is that we currently have to many bases to begin with! But who knows what the future will bring. I certainly have given up trying to predict.
I am unsure the number of E170's yet to be delivered, but I understand it is a significate number.
Right now we are anxiously awaiting some kind of agreement regarding the CHQ - Shuttle America purchase/acquisition or whatever they are calling it.
Not to speak out of turn, but we would like to see a fair seniority integration between SA list and CHQ. Currently we have yet to recieve any info regarding what or how seniority will be merged, or how the E170's and E170 pilots will be added under the SA certificate. One major concern is the ability for E170 pilots to not be forced to fly on the SA certificate alone, allowing no movement from SA to any of our other E170 certificates, ie Republic Airlines (when certificated). So for now it is just a wait and see time.
Hope this helps provide info to you.
Keep the faith!