No, there is no price increase with the new blue subscriptions. This means that existing customers will not pay any more for the existing service after the move. In fact, they may, depending on subscription, enjoy even better services for the same price.
Say, for example, you currently have the inOne mobile go mobile subscription. On 22 May, this will be switched over to the new subscription blue Mobile M. Following the move, you will enjoy surfing speeds of up to 1 Gbit/s instead of 200 Mbit/s and pay CHF 79.90 instead of CHF 80.–.