Well, it turns out we won't have to wait very long to find out. Today, May 29, 2013, showrunner Marlene King tweeted: "The Queen Of Hearts from the Halloween train will b unmasked in the premiere. U will be shocked to discover Shims identity!"
How shocked? Well, we know this: The character is someone we already know, as Marlene confirmed when a fan tweeted her: “Have we met "Queen of Hearts" yet in PLL?”, and she answered: “yes.”
Hmm, who could it be? Whoever it is, it seems they wanted the Liars dead, as members of the "A" Team (or Red Coat? Or the "B" team? We’re not sure!) nearly succeeded in killing Aria on that train!
Who do you think the Queen of Hearts might be? Tell us below!
Pretty Little Liars Season 4 premieres on Tuesday, June 11, 2013 at 8 p.m. ET/PT on ABC Family.