This is like all SPOILER. If you don't want to see it, turn back now.
I just came out of seeing the movie, and I just wanted to put my thoughts here, as a huge fan of the Tim Drake character. I was just curious as to who else feels like the John Blake character was Nolan's telling of Tim Drake? I see four main connections that seals it in my mind. First is the weakest one, the similarities in name between Blake and Drake. Nothing big there, obviously (with the last name Blake, there was actually a slight moment where I thought he was Catman, though that's not relevant). Two is his promotion to detective in the course of the movie, which I read as a subtle nod to Drake's detective skills. Another weak comparison, I know, and easy to find if you're looking. But I don't see much other reason why he couldn't have just remained a cop for the rest of the movie. The promotion wasn't even a dramatic point like with Gordon's, so I feel it was an intentional move by Nolan for some end. Then come my final two, and biggest reasons. First of the big two: the revelation of his parents' deaths. While the details are changed, the timeline is similar, with his mother dying first, then his father dying when he was older and which he saw. I think that is a powerful connection to the character of Tim Drake that is too big to be ignored, with the only major retelling being that these happened in his normal life, and not when he was Robin (or, in a pun related twist, happened while he was Robin, but then he changed his name). Finally, and most importantly, he figures out who Batman is on his own. He walks into Wayne Manor and just matter of factly states it like it is nothing. Obviously, it is not discovered in the same way, but as an ally (and, more importantly, a Robin) who figures out the identity of Batman, it has to be Drake.
Obviously, none of this has to be fact or agreed upon. But, personally, this interpretation made me enjoy the movie a whole lot more than having Blake an entirely original character. So I just wanted to see if anyone else noticed/agrees with the connections.