I think we all know what will happen. Brand will return at the end of the season only to be mediocre. Then, two options come about. He opts out and either:
*Signs with any team but the Sonics and is never, ever the same player again, and the Elton Brand we know is forver and only in our memories.
Or
*Signs with the Sonics since they will have more cap space than they know what to do with at the end of this upcoming season and he returns to his old form, shines, he joins Green/Durant to give the Sonics a title and keep them in Seattle. Though, I think they'll have left before Brand's debut with the Sonics takes place, but none the less keep your fingers crossed.