There´s a rumour going that now Sam Raimi is done with Spiderman, he will do a The Shadow movie next. It doesn´t seem implausible, he has been wanting to do one for years I believe. Also with superhero-movies grossing as much as they do, it´s probably much easier for him to get backing today.
I must admit I´m one of the few who actually enjoyed the Alec Baldwin movie of The Shadow, but I wouldn´t mind seeing one that´s more Nolan than Burton. Actually a lot of the plot could end up similar to Batman Begins I imagine.