My guess would be the Knox option would entail a swap - Stryker Bde for Knox, light bde in Hawaii. Of course also looming is the proposal to increase the size of the Army and add four brigade combat teams - they will have to go somewhere.
The IBCT facilities (barracks) will not be completed in time for the proposed move so the IBCT is heading to Ft Hood for a year. It would make sense for them to go to Hawaii and send the SBCT here to Knox as a trade. But when did the Army do anything that made sense? :-)