I don't think Discovery will hold the news until the airing of their show. That will take much too long, and there is way too much risk that the story will get out before then.
If the arrangement with Discovery is similar to 2010 (and I've been told that it is substantially the same) Discovery has the rights to break the news announcing evidence that AE and or her aircraft has been definitively identified, as in smoking gun, any idiot artifact, proof. What they desire is to be able to break the story and drive folks to their website for more information. You can imagine the web traffic such a story would generate.
This is a delicate matter of timing, of course. All the crew and TIGHAR team are restricted by non-disclosure agreements that even cover telling a spouse about a definitive artifact, at least until after Discovery breaks the story. People being what they are, Discovery knows that it will only be a matter of time before the cat gets out of the bag, so they won't wait too long. My guess, and this is only my speculation, is that Discovery would break the story within 48 to 72 hours of conclusive proof, and certainly before the ship arrives back in HI. Why risk being upstaged on your own story? The only reason I can think of for them to delay would be that they want the video and photos to post, but even then they can break the story and post video later. Unlike our past expeditions, I believe the KOK has the capability to send data if needed, so even video could be delivered well before the ship arrives back in Hawaii. Pricey, but doable.
Discovery will have the opportunity to milk this for all its worth, building interest over the several months it will take to put together the documentary show.
Once the definitive artifact is announced, TIGHAR and its members should no longer be restricted from disclosing information, so we should be able to get the full story from the expedition team.
Disclaimer - I am not the legal counsel for TIGHAR, and I've not been privy to the contract that has been signed between them for coverage / sponsorship of this expedition. I was subject to the non-disclosure agreement on the last expedition.
Andrew