Everything I have read about the merger says that all miles, vouchers will be honored. In addition it is believed that even if they announce the merger soon, it will be months before the logistics are worked out and everything is combined in the day to day operations. Until that point both will continue to run/book as separate companies. This is all what I have read in news reports, so it could be true or total crap... but if I were you, I would not worry about it yet.