source: Pro Wrestling Torch
TNA is negotiating with Scott Hall to do more dates for the company. However, he is wrestling regularly in Puerto Rico and that is his first obligation. They'll have to schedule his TNA appearances around his dates in Puerto Rico.
They're taping three weeks of Impact next week over the course of two days (Monday & Tuesday). Hall is scheduled to be at the TV tapings this Monday and Tuesday, so we could be seeing him on Impact for the next three weeks.
Hall's appearance on Impact on Thursday garnered TNA the highest viewership they've had since expanding the show to two hours.