I have updated the roadmap with the information from the Generation 4 and Generation 5 electronics pages. Some information is duplicated here so it might be worth moving the descriptions to the electronics page and just linking to that from here.
I don't know much about the new generation electronics so maybe someone on the MakerBot team or someone who has experience with the new electronics could check over the information to make sure it is up to date and still relevant to the latest prototype boards.