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Update: You can order this on Amazon now here.
I found this over on Gamestop last night here
http://www.gamestop.com/accessories/lego-dimensions-fun-pack-cyberman-dr-who/123272#media
And then I saw the bigger picture posted over on the BrickFan here. It looks like the must have announced this at SDCC? I am not sure yet, but it looks like it will be available in January.
http://www.thebrickfan.com/lego-dimensions-doctor-who-gameplay/