Here we go!!!
SPOILERS POST!!
We start with Pinkie Pie doing a comedy style work out in front of the Baby Cake Twins. It fails to make them laugh. However, the crazyness that happens after sitting on some jacks does the trick.
Edits to come from here.
EDIT 1: We get an extended version of the "Smile" song that was leaked weeks ago. We get greeted to Cranky Doodle Donkey at the end of the song and Pinkie's "Instant Friend" act fails. Now, she tries to make Cranky her new friend.
Oh, and on a side note, it's Cheerliee's Birthday!

EDIT 2: Apparently, wigs are cannon! Yep, Cranky has a wig, which Pinkie ruins accidentally. Also, we get introduced to Pinkie's welcome song and another song I can't quite put my finger on.
She even makes it up to him by getting him a new wig. During him unpacking though, Pinkie ruins a special book and he declares the NEVER be her friend.
More to come!
EDIT 3: Pinkie goes crazy trying to make Cranky accept her apology. However, he doesn't want it. Eventually, she gives up, and makes him reunite with an old friend of his.
Turns out, he was looking for his old friend the whole time and she just happened to be in Ponyville. The reuniting of a lost love is what it took to finally make him smile.
From there, Cranky accepts Pinkie as his friend and wishes to be left alone with his love. Pinkie accepts and we get the lesson and a final song.
Review to come!