Hello. Glad you like the game!
1. For the majority of the women, it's like a quantum pregnancy where we won't see anything regarding that until end-game. It's far too complex to dynamically have them change, and have alternate scenes in everything they're involved in depending on if they're showing or not. There are games that allow for that, but those women often don't interact with anyone else to avoid alternate scenes, or the scenes are completely interchangeable between all women and boring completely cookie-cutter dialogue. The character Sofia will have pregnancy involved in her route, but it will likely be handled in a manner where we won't need alternate scenes to account for her pregnancy status.
2. Yes, beyond scenes that are obvious like updates that involve multiple women at the same time, we'll be opening up for subscribers to be able to vote on bonus scenes at some point. These bonus scenes will involve that type of content, as well as "standard" M/F scenes etc. There won't be a system where you get a selection screen and manually mix and match who you want to have a scene together with, that's not really viable with 2D.
3. Customization is unlikely, as they're not 3D assets where it all can get swapped out in-engine or (relatively speaking) fairly easily be re-rendered.
4. There may be more fantasy scenes, but I wouldn't hold my breath as far as actual sexual content involving those. A planned future game is set in a fantasy setting in the Calamity of Kingdoms universe, though. That game will not be announced nor worked on until DD is complete.
5. There'll be more kissing etc. Don't expect any rimming or femdom. There might be failed femdom, though.
6. Art books get made for subscribers on our Subscribestar. Teasers etc. that get posted weekly are also available in the #teaser channel on the Discord.
Thanks!