I'm not a new hire, but I can help with most of your questions.
1 - new hires go into both the avro and saab, depending on what slots are left over after the current line pilots take what slots they want. In the last vacancy 2 went to MEM Avro, 6 to DTW saab and 6 to MEM saab. So, it's sort of a crap shoot. It seems that it is WAY easier to hold MSP now since there is finally some movement. I talked to a guy who was hired last August. He was flying reserve on the saab in DTW and for March he'll hold a build up line (reserve AND trips) in his new base (MSP) where he lives.
2 - training when I went through was a total of 3 months, but I went to old school training in MSP as well as in Woodford, England. Now all training is in MSP and I'm guessing takes no more than 2 months including O.E. You are paid your 75 hour guarantee (34.62 hours/paycheck), are given a hotel the whole time in training and you get to have your ID on the first day, so you can travel. The hotel is usually a long term stay hotel so you're not forced to eat out 3 meals a day for 2 months.
3 - Upgrade time RIGHT NOW based on no growth and only on attritian is hard to tell. For me a 4 year + FO it will be another 2 years. That means I'll be at least a 6 year FO upgrading to the saab. FOr a newhire it could be about 3 years. It all depends on about a thousand variables, of which constantly change. You don't want to come to Mesaba for a quick upgrade... beacause right now that isn't happening. THe most junio captain on the latest vacancy has a seniority date of Jan 2000.
4 - seniority is based on age. Oldest is most senior in your class.
5 - Hard question... could be better of course, but there are FAR WORSE places to work than Mesaba. So being a glass half full kind of guy, I'm mostly happy. Except for the regular B.S. one deals with and the stagnant career.
6 - First rule of the airline biz... don't believe rumors. NWA controls every aspect of the destiny that Mesaba has. If NWA wants us to grow, they'll grow us. The growth has favored Pinnacle since our last avro and saab were delivered and they started getting CRJs in 2000. Our future is also held closely by the NWA pilots. There is a big plan... but we'll know about it when they want us to know about it.
Good luck and I hope you find a place that suits you.
FO