I had a look on IMDB and there's no mention of a cameo, I did find this though:
The Ridder. There has been speculation on the web that the man who tried to blackmail Batman, named Coleman Reese (Mr. Reese = "mysteries"), will either be the Ridder or have some connection to him. Moreover, in one of the newspapers released with the viral marketing, there is a 'letter to the editor' that is authored by Edward Nashton, a common alias of the Riddler.