The one thing I hated in L2x was the spammable mana potions – which we had here at the beginning in 2009 (the ones that instantly restore mana). We implemented this kind of mana potion to prevent people from spamming mana pots, otherwise mana is useless.
We buffed Body to Mind a bit, so we might give Mana Regeneration (Spellsinger active skill) a small boost as well, but other than that I don’t think Mana Potions need more changes.