Long Rest: If they limited long rests they'd have to rework their companion quest triggers (Gale, Astarion,etc) , boss introductions (Raphael), tadpole dreams, pets and followers joining camp... so, no thanks. They are already popping up one after another, or not showing up if you get even slightly too much approval between two consecutive rests...
Also, if someone wants to beat the game by resting every 5 minutes, let them. Most of act 1 is easy enough to beat, with plenty of team combos that mow down everything without blinking, but if anyone needs it, let them do whatever they can to experience the entire content.
The finished version will have different diffficulty levels. They may limit resources (or modify the AI so that players will have to practice good resource management anyway.)
Character Creation: Additional voices have been datamined (4 more iirc) but they don't have as many recorded lines as voices 1-4 so we probably won't be getting them in Early Access.
+1 to having different body shapes. Unless I invest in strength and constitution for some weird RP reason, I don't want my 8 str wizard looking like my barbarian.
Body sizes might present an issue because animations already look wonky on smaller races... and hopefully smaller races will get their own custom animations like the elves did... but I can't see them going the extra mile just for body sizes.