So episode 7 is called "A good man goes to war" which on the surface will not appear to reveal anything.
First consider that there is currently a Doctor clone running about, the fact that the Doctor drove the point home throughout that episode that the "clones" were 100% legit (perhaps hinting that the clone can/will regenerate).
Secondly, consider that River song said she went to jail for "killing a good man", many people have assumed that to SOMEHOW be the Doctor, and having this clone makes this completely plausible.
Hopefully it is a misdirect, or I am just making non existent connections. Time will tell.