Omg i believe that too... There was that one time when Undertaker told our Ciel in his sleep that is still not his time to wake up but will be soon...
Actually, there has been quite a bit of evidence throughout the manga that suggests that ciel has a twin, and the reason that Lizzy is going along with this is that she was in love with the original whom she thought was dead. In this case, this new ciel is the original and we don't know the name of this twin. Here is the link to the theory.
http://theofficialdoublecieltheorist.blogspot.com
Why not? If they can have NASA era computers in 19th century England, why not cloning too?
Sooo my theory is that this has something to do with the blood that they took from Ciel. Probably is a clone and Lizzie is involve in this, that's why Paula was talking about not wanting Elizabeth to cry anymore... so... there is a big posibility of Lizzie taking part in creating this new "Ciel".
Also, the thing new-Ciel said about being the real Ciel probably means that he is like the original Ciel... maybe the Ciel that Ciel would be if none of the bad stuff has happen to him. (?) Like a perfect version of Ciel D: or maybe it has something to do with Undertaker wanting to bring Vincent back xD but i don't think is the case, because the new-Ciel really look like Ciel x.x and also does not have the mole under the eye that Vincent has...
but i don't knoooow, i'm reeeeaally confuse ;; (sorry for my bad english, i'm trying my best D:)