Of course they will. They'll get to leak his tax records and then let whispering campaigns run wild on how many "illegal" tax dodges he is using. The general public...including the NY attorneys, you and maybe me...have not the first clue what a billionaire's taxes look like and how many programs provided for by Congress he is engaged in. I say maybe me because I did study tax law in bschool for two semesters, so I might have a first clue, but I'm still far from being able to understand it.
This has never been about a suspicion of wrongdoing. It's about new fodder for feeding the ignorant "news" about how much Trump is cheating them on his taxes.
I’ve been a tax CPA, and I have worked on returns of very high multi millionaires. (No billionaires that I recall, but the concepts are the same.)
I guarantee you there will be absolutely nothing that they can glean from his returns that can damage him. I saw his entity structures (multiple) on his financial disclosure in 2016, and it is so extensive it would take a team of forensic accountants weeks to unwind it.
None of that will be on his return. His return would only show the items of income that reach him personally; kind of like the portion of the iceberg that is above the waterline. Everything below the waterline won’t ever appear on his return.
So I will say with 100% certainty that anything they come up with will be complete fiction.