A few comments.
Overall love the new look - very clean, much better than the previous menu bar on the bottom. One small thing. In my view, the Add-Ons and Registration should be clustered with Settings and Support, because these are not active menus constantly being used. I understand about the desire not to make it difficult to find a purchasable addon. But, for me, I intuitively start looking for add-ons or registration in the setup/help sections, similar to looking for add-ons/extensions in Chrome. And having all the active menu items (i.e., Dictionary / OCR / Reader / Flashcards) clustered together makes sense. I use an iPad mini and so holding the device landscape places my left thumb right at the active menu tabs (i.e.,toward the top of the left side).
3) Too bad about the forum not being able to configure Last Message In at the top. Maybe it's just a matter of getting used to it, but I found that very convenient in the previous version of the Plecoforum board.