Drinking potions and activating them later has been confirmed.
Marek Ziemak:
You will still have to drink potions before combat, but you will be able to activate their effects any time you want, as witchers can control their metabolism.
Reference:
http://news.softpedia.com/news/The-Witcher-3-Wild-Hunt-Exclusive-Interview-with-Marek-Ziemak-Gameplay-Producer-344780.shtml
Edit:
Sorry I hadn't noticed gregski's post.
Marek Ziemak:
You will still have to drink potions before combat, but you will be able to activate their effects any time you want, as witchers can control their metabolism.
Reference:
http://news.softpedia.com/news/The-Witcher-3-Wild-Hunt-Exclusive-Interview-with-Marek-Ziemak-Gameplay-Producer-344780.shtml
Edit:
Sorry I hadn't noticed gregski's post.


