I would agree with all the above, very early days for PP and many others signed last year. I believe Mac's program was to field a conceptually good but Basic package in the early stages to give the team time to work hard on delivering a solid chassis for the second part of the year that can be carried over to 2016, that is the way I would have gone.
Whether or not that will result in a b spec car is yet to be seen, if they do it will be for the reasons of significant changes to the internal layout of the engine or the cooling system or to change the wheelbase or move the bulkheads, most of the changes could be made to the current car I think