While we still do not have a definite answer as to how long he has been upset with the company, we do know now that CM Punk was already contemplating a departure from WWE as early as Royal Rumble 2014. He vented to Mick Foley at the time about not being happy within the company and having trouble dealing with injuries.
While there was some interest in bringing him back a couple of months ago, it does not appear that Lance Hoyt will be coming back to TNA anytime soon. He is currently thriving as a tag team with David Hart Smith in New Japan right now, and the money there is higher than what he would be paid if he was working Impact Wrestling again.
3AWrestling has booked themselves a pretty big show on March 29 in Ontario. Jeff Jarrett, Jim Duggan, David Hart Smith, Karen Jarrett and Robbie MacAllister (one half of the Highlanders tag team in WWE a few years back) have been signed on as headliners.