So PopCynicka has just posted what they call a verified source's description of the Dark Knight Rises prologue that is attached to MI:4.
It starts with a father, mother, and son arriving in the Dominican Republic. The son gets kidnapped and is ransomed. Apparently the father is involved in some shady stuff, when he pays the ransom money the Kidnapper says that he was paid to kill him and the ransom is just a bonus.
The Boy has to single handily kill the 3 kidnappers and we learn that his father was called Bane and was a mercenary. Then the boy has to grow up on the streets of the Dominican Republic.
You can read the whole, in-depth description of the prologue yourself at Popcynicka here:
http://popcynicka.wordpress.com/2011/12/07/exclusive-the-real-dark-knight-rises-prologue-description/
How does that sound to you guys? If Nolan is having kid Bane kill people I don't see why he couldn't use Robin.