What a great IB! I'm looking forward to next week, after missing this from last year.
In addition to the previous posts, I have found in the v2 pdf:

6.7 Nanro Cave: "No identical numbers from different regions may not be orthogonally adjacent to each other." - Remove the No?
10.2 Digital Kakuro: The instructions mention Placeholders. Does this mean that hint numbers could be "?" (=1 to 9) or "??" (=10 to 45)?