Baby Rainbow Dash was sooo cute in the new episode! x3
I have to complain some though. "The Cutie Mark Chronicles" felt very rushed, particularly near the end. Fluttershy, Applejack, and Twilight Sparkle had lengthy, informative segments; Pinkie Pie and Rarity, not so much. Instead of cutting them short, I think a second episode would have been better. =/
Also...
Rainbow Dash earns her cutie mark by performing a Sonic Rainboom (if you couldn't guess it from previous episodes). Did you notice she was racing against the same ponies that claimed a Sonic Rainboom was "an old mare's tale" in the episode "Sonic Rainboom"?