So it seems like the debate over whether or not the previous claims of the Dimension X figures being NYCC exclusives were legitimate or not have finally been answered. NECA teased just two exclusives for NYCC this year on Twitter and I asked them whether one of them was TMNT-related.
Turns out, they're both DC vs. Dark Horse, meaning whatever the previous claims were based on was probably just a misunderstanding.
Edit:
Fully confirmed, no TMNT NYCC exclusives this year.