If you're talking about the end of series 6, no. It was a Teselecta in his place.
Eventually yes, he will regenerate into the twelfth Doctor.
A future version of the 11th Doctor.
The Spaceman in Series 6 episode 1 killed a future version of the 11th Doctor.
The 11th Doctor in Doctor Who is portrayed by actor Matt Smith.
Matt Smith
He hasn't yet. The tenth doctor will be regenerating into the 11th Doctor around Christmas/New Year of 2009.
There are no plans as of yet, but it is certain he will stick around for the 50th Anniversary in 2013. After that, he will probably be gone within a few years after 2013.
11th doctor
An Astronaut
Matt Smith is the 11th Doctor. He will replace David Tennant.
If you mean in doctor who it is the 11th doctor the actor is Matt smith
The actor playing the 11th doctor is Matt Smith