I apologize ahead of time for this wall of text, just want to clear up why this was made and why it does not get the Mixology buff to anyone who may not yet understand.
The idea behind this flask is to basically give alchemists the same bonus as every other profession gets as a passive.
For example, enchanters get Enchant Ring - Assault, and assuming they put it on both rings they get an 80 AP bonus all the time. This flask gives 80 AP and is never consumed so it is the same bonus and you only need to pay for it once. This flask is not affected by Mixology because that would break the balance greatly in the favor of the alchemist ( I am an alchemist for the record :P ) giving a greater advantage to us is the arena.
In raids and such clearly enchanters still have their ring enchants AND can drink flasks while we can't use both at the same time, which is why we have Mixology. Flask of Endless Rage gives 180 AP, and with Mixology in 3.2 the bonus becomes 260 AP. In short Mixology is our passive raid bonus, giving us the same increase in stats as the corresponding equivalent in other professions ( Assuming they have one, for example only jewelcrafting and alchemy have a spirit bonus item ) while allowing us to maintain flexibility. An enchanter can't enchant his rings with haste, and a leather worker doesn't have a fur lining for hit rating, an alchemist on the other hand can drink potions that give any range of these skills AND can mix combos for some interesting choices while retaining the option to change these bonuses at any time ( only downside is elixirs don't persist through death, but they are are quite inexpensive if you also have herbalism ).
Blizzard has been working to balance the primary professions as much as possible, and has come very close for most of them. In fact from my research the only professions that are not in line ( Jewelcrafting and Tailoring ) are actually more powerful when compared to the rest. I did not compare them to engineering however because the bonuses gained from it are of a much more subjective value and almost impossible to quantify directly. ( Also I want to tell all JC to stop complaining about the change in 3.2, gems losing prismatic quality is hardly reason to declare jewelcrafting as completely destroyed, your bonus is actually a little higher then most and is the highest of the fixed stat bonuses XD )
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Enchanting 40 AP Enchant Ring - Assault + 40 AP Enchant Ring - Assault + 180 AP Flask of Endless Rage = 260 AP
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Enchanting (Arena): 40 AP Enchant Ring - Assault + 40 AP Enchant Ring - Assault = 80 AP
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Blacksmithing: 40 AP Socket Bracer ( Bright Cardinal Ruby ) + 40 AP Socket Gloves ( Bright Cardinal Ruby ) + 180 AP Flask of Endless Rage = 260 AP
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Blacksmithing (Arena): 40 AP Socket Bracer ( Bright Cardinal Ruby ) + 40 AP Socket Gloves ( Bright Cardinal Ruby ) = 80 AP
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Inscription: 80 AP Master's Inscription of the Axe ( Note: Taking into account Greater Inscription of the Axe ) + 180 AP Flask of Endless Rage = 260 AP
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Inscription (Arena): 80 AP Master's Inscription of the Axe = 80 AP
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Leatherworking: 80 AP Fur Lining - Attack Power ( Note: Taking into account Enchant Bracers- Greater Assault ) + 180 AP Flask of Endless Rage = 260 AP
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Leatherworking (Arena):80 AP Fur Lining - Attack Power = 80 AP
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Jewelcrafting: 28 AP Bright Dragon's Eye ( Note: Taking into account Bright Cardinal Ruby ) + 28 AP Bright Dragon's Eye + 28 AP Bright Dragon's Eye +180 AP Flask of Endless Rage = 264
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Jewelcrafting (Arena): 28 AP Bright Dragon's Eye + 28 AP Bright Dragon's Eye + 28 AP Bright Dragon's Eye = 84 AP
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Tailoring: Equivalent Approx. 133 AP Swordguard Embroidery (Note: 25% proc rate, 45 second ICD) + 180 AP Flask of Endless Rage = Approx. 313 AP
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Tailoring (Arena): Equivalent Approx. 133 AP Swordguard Embroidery = Approx. 133 AP
Tailoring Note: actual value may be lower depending on class and cloak enchant ( Example: 22 agility on rogue/shaman/cat druid = 22 AP )
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Alchemy: 180 AP Flask of Endless Rage + 80 AP Mixology = 260 AP
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Alchemy (Arena) 80 AP Flask of the North = 80 AP
As you can see, the overall balance from profession only bonuses are actually quite balanced, I also have the numbers from many other stats ( SP, agility, strength, ect ), though it is mostly only the offensive based stats that are factored in on the profession balance, with things such as stamina stacking being more powerful in other professions. It is also important to note that this is just comparing the direct passive bonuses ( alchemy's isn't technically passive ). There are other bonuses to take into account such as the alchemists endless healing and mana potions which are also getting a nice 3.2 buff/nerf.