Just saw the sneak preview clip... OMG, I love Maud! Even though I think it's weird how she's wearing some kind of medieval times-type outfit. Also, totally called that additional sister in Pinkie's Pride coming back! Though I honestly wonder why they bothered inventing a new character instead of just using one of Pinkie's two other sisters... unless they're both going to appear in this episode.
Also, how could she throw her pet around like that?!

Edit: Saw the Facebook clip... Again, I get the feeling that Maud just isn't as amazing as Pinkie makes her out to, but then again, that won't exactly make Maud malicious, just that it sets some high expectations for the mane 6... I also can't help but feel like Maud won't live up to anything Pinkie says about her.