Likely a (very smart) pilot program on Amtrak's part. I'd raised this idea on here some time ago, but...
However, this move also smacks of shenanigans: Doing this will likely allow Amtrak to pump up ridership on the Star, Crescent, and Cardinal, all of which are off noticeably for FY2013 as far as May (5.4%, 4.6%, and 3.6% respectively). Note that the Meteor, which is basically "breaking even" YTD, is apparently not being sold. If this is successful, it's a "quick fix" for LD ridership for FY13 (presuming the ridership is credited to the LD trains and not to the Regionals). Also note that FY13 ends on...wait for it...Sept. 30.