I went to the interview back at the end of last month (29 oct). They said they will be pretty much shut down for the holidays with the last class beginning today 12Nov. Next class tentatively 4 Jan. The guys that made it to that class were interviewed 3 weeks before me. I received notification of passing the interview exactly 10 days afterward.
On the average they were interviewing 6 people per day on mon, tues, wend (18 per week). Percentage of hirees (I'll take a wild guess based on my interview day and two others where I knew people) somewhere around 50-60%. In otherwords they are hiring about 24 per month (once again my best guess). The class size for the Nov class was 24 or 28, so that makes sense as well.
My impresion of the company was very good. It looks like they take care of their people and are proud of their company. They should be around a long time.