I think the backers will get this packet really soon, as it looks solid enough to get a very good idea of what the final game will be. The delay in sharing this stuff is purely so backers don't build up expectations based on stuff that can/will be discarded in the brainstorming/playtesting process, according to Matt's comments on the matter.
My understanding is that this packet is the solid basis on which the rest of the game will be built upon and, as such, it'd make sense for MCDM to share it with backers ASAP