I personally don't think anything will change until the company goes steady state in 2018 sometime. After that, my guess 10% per year. They only rumor I heard was an increase for some SAP givebacks which is very popular in terms of making more money, creating more total days off or creating more productive schedules for yourself. So that talk may be DOA.

I would quit if you have at least 3 years at the same company. Some of these guys on there 3rd airline in 5 years are going to have to answer for that when they get called to mainline. A wise mainline guy told me it's ok to quit as long as you can clearly demonstrate its a vertical move, and your reason for quitting can never be anything you could or should have known before you took the job.