What I'm seeing/hearing from various sources. No special inside information. Just a compilation of what's out there:
Nate Woody: He's preparing to leave App State. GT has an offer on the table to him. Offer is going through legal and HR vetting before it can be official. However, Woody has a history of passing up offers to stay put in a good situation. In 30 years of coaching he's only coached at Wofford and App State, and not due to lack of other opportunities. He's got a good thing going at App State (for example, the shut out of Toledo in the bowl game.) Wake and Miss St both went after Woody last year. Houston reportedly had some interest as well. He stayed at App State. Also, the HC position at his alma mater, Wofford, just opened with the retirement announcement of Woody's mentor, Mike Ayers, two weeks ago. Woody spent 22 years at Wofford under Ayers. Ayers, CPJ and Woody go way back, having coached against each other in the Southern Conference going back to the 80's.
Charles Kelly: GT is interested in bringing Kelly back as the 10th assistant. (Or looking at him as a DC candidate if Woody declines.) Kelly has interviewed with Colorado State, but Mike Bobo has interviewed at least 6 candidates and hasn't found the "right fit". Bobo has said he's taking his time. Implied he wanted to see who becomes available in the coaching turnover after early signing day. Possible rub here, CSU's outgoing DC made $230k last year, Kelly made $830k at FSU. Kelly may want to stay in the Southeast, where he has connections. Presumably, his goal is to get back on track to be a P5 head coach someday.
Andy McCollum is likely to get a raise, maybe a paper promotion (new title). Haven't heard anything substantial that he's in consideration for DC, just pure speculation.
[Speculation on my part: Woody made $223k at App State. I'm assuming he'd get a big raise coming to Tech. But probably not close to the $800k level CTR made. Might be enough extra $$ there for GT to raise CAM and out-bid CSU to bring Kelly in; as something like an associate head coach, defensive assistant, recruiter. Help mentor Woody on P5 level recruiting until Kelly gets a better offer to be a DC somewhere.]