Yes, the site logo changed. This is because site stylesheets are all brand-spanking new, and we have 15 new themes for you to choose from! More info here.
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Sunset Shimmer as Twilight Sparkle
Sunny Flare as Rarity
Indigo Zap as Rainbow Dash
Sugarcoat as Applejack
Sour Sweet as Fluttershy
Lemon Zest as Pinkie Pie
Twilight Sparkle as Sunset Shimmer
Garble as Spike