It's not an evolutionary design. There's also no accommodation for 20" wheels by redesigning to make it easier to have wider 20" wheels and be able to install fenders, etc. It's not all that different than the Birdy 3, so why bother buying this when you can get a R20? That new frame design is not better from an aesthetic point of view from the monocoque frame. So other than having money to splurge and being able to say you have a limited addition P40, what's the incentive?
The delay in rolling this out after posting the teaser photos in September points to lack of organization for what should have been a major rollout. Probably some internal chaos and some issues with R&M but all speculation. Not unless someone within the organization is willing to let us in on what happened and the likelihood of that is slim.