Looking at the connection, incorporating bus lanes on the rebuilt bridge would really only be helpful for inbound from the south and outbound to the north. Bus lanes on Seaport Blvd would be a much better plan for improving that aspect. I'd say build the bridge to support one lane vehicle traffic in each direction with sidewalk in case it is needed during a bridge closure. In practice, the "lanes" will be pedestrian and emergency vehicles only and the sidewalk will be cycle track. Design shouldn't preclude the alt usage, but should be made to look for pedestrians and not just a road that people walk on.