Guys, this E-mail is just specifying the details of a new MOU signed between the two MEC's and the company. It doesn't mean the company is going to furlough anyone, it just means that IF the company furloughs, this new MOU provides protection to furloughees in the form of a transfer to the ERJ operation.
Regarding first year pay, I would be 90% sure you'd retain your current longevity date for pay and perhaps vacation (being that we are officially the same company) but you'd have to start at the bottom seniority-wise for bidding purposes.