But you can also state that it is already assumed there will be optimization to gameplay.
The way Bethesda's statement is word there will be optimization to both gameplay and quests. If they were going to add more quests via a patch, then Bethesda would have simply stated "additional quests" which would probably be in it's own sentence rather than combining it with the "optimization" sentence.
I am more interested in the new survivor mode difficulty because currently it is too easy. Based on the way I currently play on survivor mode with only non legendary weapons and light armor (around 80 - 90 damage resistance), I would have expected to only be able to play the game on very high difficulty at best. Hopefully the new survivor mode will force me to change the way I play the game beyond eating and sleeping.