I'm pretty sure the game has been decided as a TBS a long time ago. The didnt wanna say it because they'd rather show it.
1. Sven mentioned an exampe, during a fight you can set a chair on fire, pick it up and smash it on someone's head. I can see this working in a TBS pretty easily, but in RTWP? It would be a nightmare to micro this while you are getting beat up by random monsters at the same time. 2. This is gonna be a MP game from the ground up like DoS2. Do you know what 4+ people, fighting a battle at the same time, while all having a pause option would look like? Worse than a slide show for sure. You unpause, one guy pauses. He unpauses, but the 3rd guy isnt done. So he pauses amd the first one messes his thing now cos he didnt expext it. Literally unplayable, people. 3. TBS is something that is natural for dnd, it would be a lot easier to implement features that had to be cut in RTWP. 4. Juat cos itw TBS it can be vastly different than in DoS2.