There's many new things. Art matters to me. The art in the new book is spectacular, the cartography is better, and the character portraits are far more superior. The book comes with two brand-new, double-sided maps and a copy of a new Arkham Advertiser. I find these to be invaluable updated props. I couldn't showcase them because they didn't come with the review copy I received. Whether or not these new things meet your threshold for "worth it?" I have no idea. You may need to hit up your FLGS when it gets there and flip through the book. I'll also be posting an Unboxing when I receive my Leatherette, so if you subscribe you'll be notified when that video hits: https://www.youtube.com/c/rpgimaginings/videos
Options, options, options. As a Keeper, I interpret anything in a book as options. I may run a game almost exclusively in Arkham, and as such, grant Navigate (Arkham) and/or History (Arkham) as player post-session awards/updates. If that were the case, I might discourage my players from wasting character creation skill points in Navigate, in favor of a broader array of skills. Not all skills are intended for character creation.