Facebook has just announced that George W. Bush is going to be present tomorrow November 29th to answer questions about his new book Decision Points. The discussion will happen on Facebook Live at 2PM PST.
It is unclear whether Mark Zuckerberg will be attending the Q&A but its likely. I can only assume that Facebook is the platform for this discussion because of the sheer number of members Bush can reach at one time. There is no mention of who will interview the president and how long it will take but I am sure more information will develop as we get closer to the time frame of the interview.