Over on the official World of Warcraft forums, Blizzard poster Eyonix has posted something regarding changes being made to flask reagent costs and potency in patch 2.1 for World of Warcraft. Check out the example below in convenient list form.

• Flask of Mighty Restoration - Current

Instant, Regenerate 70 mana per 5 sec for two hours.
Reagents: Dreaming Glory x20, Mana Thistle x10, Fel Lotus x1

• Flask of Mighty Restoration - Patch 2.1

Instant, Regenerate 25 mana per 5 sec for two hours.
Reagents: Dreaming Glory x7, Mana Thistle x3, Fel Lotus x1

• Elixir of Draenic Wisdom: Intellect and Spirit are increased by 25.
• Earthen Elixir: Reduces both spell and physical damage taken by 20.
• Elixir of Ironskin: Resilience is raised by 30.
• Elixir of Major Fortification: Increases health by 250 and provides 10 health every 5 seconds.

Via WoW Forums