Scott Conroy of Real Clear Politics reports:
"Starting this weekend, Sarah Palin will embark on a ‘One Nation' tour of historical sites that were key to the formation, survival, and growth of the United States of America," SarahPAC treasurer Tim Crawford said in a statement to RealClearPolitics. "The tour will originate in Washington, D.C. It will proceed north up the east coast."
Details were still being hammered out on Thursday, but sources indicated to RCP that the bus tour is expected to last several weeks and will be divided up into separate geographical stretches for logistical reasons.
Members of Palin's immediate family are expected to join her on the trip, which will eventually take her through key early voting states.
The first leg of Palin's tour will reportedly begin this Sunday, in conjunction with her participation in the annual Rolling Thunder motorcycle rally in Washington, D.C. Meanwhile, a "pro-Palin documentary" will be premiering in June in Iowa.
Update: You can see some pictures of the Palin bus here.