Hi dustmouse,
As standard policy, we can't comment on unannounced products. But since it's Christmas...
We're always working on the next generation of Netduino technology, but you can rest easy knowing that Netduino Plus 2 is and will continue to be the best Arduino-form-factor NETMF board for some time. We pack a lot into these boards, so that they can be best-in-breed for at least 18-24 months.
We've designed a dozen new accessories this year for Netduino and Netduino Go. Lots of cool hardware to come--but for the next few months any new goodies will be accessories.
Chris