MAX is more intended to upgrade interurban routes these days rather than express routes as such. The X46 isn't an express, stopping at all stops between Durham & Crook (/Stanhope). The growth figures being seen across the network on services already upgraded would lead me to think that this will become the minimum specification across most routes, barring those already branded in other brands such as Sapphire. There's limited scope to expand the Frequenta brand for example but there will be expansion of Sapphire this year I am sure.