According to the Washington Post, yes

This part I didn't really like:

It is unclear what players the A's would be willing to give up for Johnson, but the Nationals have shown previous interest in 23-year-old first baseman Daric Barton, and a deal centering upon Johnson and Barton would make sense for both sides.

Don't get me wrong, Johnson is a damn fine player and all, but will I be the only one who is a little peeved if Barton is dealt for him?  Barton would have more value playing in Sacramento for a year and then coming back when Giambi leaves, wouldn't he?  Johnson can't have that type of value, given that he's not healthy, only played 38 games last year, and is a free agent to be. 

I'll hold out hope that somehow Ryan Zimmerman is going to be pryed away from the Nationals too.