As far as I know, we are still taking delivery of some new UAX 700's....this was planned a while ago, the intent was to replace the Bros. But now it looks like the Bros are staying for a while too.
UAL has already done an RFP to replace mesa, SKW has a bid in for that as do other regionals. Everyone's just waiting for OJ to zig when he should have zagged...he cannot survive even one mistake at this point.