Whilst it would be cool to see a team in Seattle again I don't think the NBA has any plans to make any more teams and has talked about contracting some of the current teams.
Are they trying to get a current team to move there!?
If they do, the NBA will need to add another team in the east - likely, New jersey (once the net's move), Rochester (original home of the Royals/Kings) Syracuse (original home of the Nationals/Capitals/Bullets/Wizards) Buffalo (Clippers original home - aba) or maybe even Kentucky.
It would be mad to see Seattle have a team again, but it's gotta be named the Sonics and have the same green and yellow jerseys is if happens. Move the Kings there, (if the Kings move)