Wait.. could prepared casters still change their memorized spells at-will outside combat in the "release version"?
If they want Wizards to play like that, why even keep memorization in then? It's just a pointless chore to unmemorize a combat spell when you need a non-combat spell like Knock or Detect Thoughts, and then switch back after casting. And memorizing/unmemorizing Mage Armor every time after cast. They're effectively only limiting spells for combat.