I was so excited to finally know the name of the original Petrova girl, Tatia. Hopefully we'll see her in some flashbacks, which would be quite exciting. Now that we know her name, I hope the writers include in episodes more about her, like where she came from, and what's her child's name. She, just like Katherine had a child out of wedlock, and Elena just like Katherine fell for two guys at the same time= these Petrova girls don't only have their looks incommon, these girls might have similar personalities.
I know what everyone has been saying, could Tatia really be the person killing all the founder council members? But if it really is her, who turned her into a vampire (Esther? But why?) and wouldn't that make her an Original? This does seem impossible, but we did just see Esther come to life after Niklaus killed (and buried her) thousands of years ago). It seems like it doesn't make sense to be Tatia, but it would make a good story line if she came back.