I'm not so sure that the title has anything to do with Cybermen because we already know that Cybermen are in it from the trailer so releasing the title wouldn't really be giving away any of the story and it wouldn't explain why they're keeping it secret.
Then again, I may be wrong - I often am.

Agreed, rohosoho.

well there are pictures of another kind of cybermen

You know, I really, REALLY would love to see some new villains. It would be amazing for the Doctor to have someone new to fight against over a season and not have all his wonderful insights into who they are and what they want. I hope the Christmas special at least does something different with the cybermen to make them more interesting and keep the plot from feeling recycled.

Its none of them
It said in the trailer at the end of the last one that its called the return of the cybermen
didnt it????

RTD said it deffinatley wasn't the title

Why not?

I read somewhere that the official title is The Other Doctor.

The title is officially "The Next Doctor." I was close. :-P