TNA Wrestling is looking to get re-established on traditional pay-per-view. They’re aware they are low on mainstream star power, which is one of the reasons they were planning to go after Dolph Ziggler aggressively.
While Ziggler hasn’t re-signed with WWE yet, he’s indicated that he’s going to stay. We clarified what turned out to be a false rumor that claimed he had already re-signed, which is something Ziggler confirmed himself. Dolph had been adamant for months that he wanted out, but whether it's a ploy or not, that's usually the only thing that ends up working with WWE in terms of getting a better deal and better treatment.
Ziggler staying with WWE gives Rey Mysterio more leverage with TNA. Mysterio has a standing off on the table from Lucha Underground, but it hasn’t been signed and Lucha Underground has been dragging their feet while the details of season two are worked out. Lucha Underground is in financial limbo right now, which does create an opening for TNA to try to step in and snag Mysterio.
TNA can't offer Mysterio anywhere near what Lucha Underground is offering though. The Lucha Underground offer is near $1 million. The TNA offer is around half of the Lucha Underground offer. But you're dealing with two companies that are in volatile situations, surrounded by much uncertainty.