First, get some sleep. For a brief answer to your questions:
(1) Horizon status: Not much change, still motoring along. You indicated that you'd like to return to the Pacific Northwest. Horizon would be a good place to work for two or three years. I wouldn't plan on staying here permanently.
(2) Jet deliveries: To be perfectly honest, no one knows. Most of us suspect that Air Group management has been transferring some of our jet deliveries to SkyWest. The pilot union sued the company and the Air Group has been ordered to turn over the documents, but I haven't heard anything more on this issue. We currently have ten jets on the property.
(3) The jet appears to be overstaffed. The training pipeline is also "plugged" at this time, with people waiting weeks for IOE trips (not enough airplanes? Not enough trips?). The Q400 is still short-staffed. The training department seems to be catching up, but most of the new hires are still experiencing delays in training. Most of the new-hires in the Q400 are taking three months (or more) to get out on the line. Horizon is also "close to" hiring street captains for the Q400, due to the lack of upgrade-qualified FO's. At the present time, we do NOT have an FAA-approved program for this, so new hires with previous Part 121 experience have to do both the FO and upgrade training programs.
(4) Other: The jet base is Seattle. Q400 bases are Portland, Medford, Boise, Seattle, and Spokane. A lot of guys/gals are getting Portland right out of training.
You will most likely be offered the Q400. The trips are hard, but we do some interesting flying. If you want the jet (and are offered a job), you may have to wait a few months for a class.