Aaron Wilson(@RavensInsider), an NFL insider for National Football Post, tweeted that the Broncos have activated RB Andre Brown from the Practice Squad.
While we'll wait and see what roster move(s) will follow this, one has to wonder if the Broncos felt Brown could be plucked off the PS by another team looking for running back help(New Orleans comes to mind with the loss of Reggie Bush)
I spoke to an NFL Agent about such situations and he told me that it is up to the player and agent to decide whether or not they would notify the existing team. I'm not saying that is what happened here or not, though with the number of running backs injured the first two weeks of the season it would make sense for another team to have interest in Brown, especially if he is healthy.