Khyber is a dark and dangerous place, full of flame and smoke, where ever stranger things lie dormant.
Long story short since I have to go to work right away: I've never understood the marriage between Vancian spellcasting and D&D. Vancian spellcasting is an antique. Something that doesn't lead itself to very cinematic or interactive gaming. A caster shouldn't just "forget" a spell in the middle of combat it's almost as nonsensical as running out of mana points and screaming "OOM". Ugh. In almost every aspect the AEDU system is better so I don't understand why WotC is backpedaling away from a system that worked to a system that never worked?