Aircraft number 6 will be in MAN in time for the start of the Summer but used for frequency increases/seasonal routes. Remember that CFU, HER, DLM etc will be making a come back and MAN takes over all of the AMS rotations.
According to someone from "commericial" there is only space for one new route, that being PMI. That would indicate that the 7th aircraft won't be next Summer. Promotions, base transfers and brand new recruits planned do, IMO, seem more tham required for 6 aircraft but thats my opinion. It certainly lends it's hand to the EMA rumour and the suggestion that MAN crews will be operating these. We're getting into pure speculation there though.