The Stout Alemental is available for purchase during this in-game holiday for 200 Brewfest Prize Tokens. If it's the only pet/toy that you need or want to collect, it should only take you a couple of days. Depending on how well you do during the ram racing, of course.
Speaking of which, Blizzard changed the ram racing slightly -- instead of using an item given to you by the quest giver, the reins to make your mount go faster is now an Extra Action Button. You still get the item, but it's infinitely easier to keybind the button and/or make a macro to use it.
I recommend setting up your binds prior to even starting the ram quests, as the one you get that allows you to collect as many tokens as you can starts quite abruptly after turning in the prerequisite quest.
Anyway, after two days of doing all the quests/dailies and killing Coren Direbrew, I collected enough tokens to buy my new pet!
While idling about waiting to see if it had any special idle animations, I noticed that its color shifts back and forth between orange and a dark brown.
As you can see in the images above, the Stout Alemental starts as a bright orange but then changes until it becomes a dark brown, and then back again. Pretty neat and subtle effect!
It's also significantly bigger than its cousins, the Skunky Alemental and all of the Pandaren spirit pets. Add a Magic Pet Biscuit, and the Stout Alemental is even taller than my nelf! haha
So far I haven't seen it do anything interesting, but I guess we can't ask for too much. It's enough that we get a new pet, yea? :)