Mana regen lvl 1-15

Just wondering if with the classic wow release you'll be reverting back to how mana regen and health regen used to be, I want to be using water and food that I start with and die if I pull 2-4 things at once being a hybrid class or die if I pull 2 things as a dps/tank class for levels 1-15. That's how I remember it in classic and the Burning Crusade then near the end of BC mana regen got changed completely, I just want to know if it's going to use the old mechanics for mana/health regen or use the newer version. In combat regen should be nonexistent until you get MP5 gear so we can actually use our food/water we start with.