TNA will be moving to from Thursday to Wednesday nights starting next week on Spike TV. The move will be permanent.
The change is likely for two reasons, one is the stronger scheduled of NFL events on Thursdays in the fall, and the other is the chance that Smackdown will be moving to Thursday during the fall season.
The move is interesting since the show is only under contract for six or seven more weeks. Some would consider this move as a good sign, because if the show wasn't going to be renewed, making a big change because of football, or Smackdown, wouldn't be necessary.