The Pi 2 took the Pi community something by surprise- nobody was prepared for it, and it’s different enough that a lot of old Pi things simply don’t work.
RPi.GPIO is one of those things- it has become the cornerstone library for doing GPIO on the Pi, but the developer who maintains it has only evenings and weekends to bring it up to speed. Dot3k wont work until it’s updated, unfortunately, and the same applies to basically all Python-based GPIO on the Pi.
Watch this space for updates on what works and what doesn’t: Raspberry Pi 2- What works and what doesn’t!