Though 'Game of Thrones' has been on the air for two years now, with a hotly-anticipated third season of the fantasy drama from creator George R.R. Martin due to arrive on March 31, many fans consider it a miracle such a high-concept series made it to TV in the first place. That wonder may soon become far more commonplace as series author and HBO executive producer George R.R. Martin has signed an overall deal with the network to develop future series! Find out about George R.R. Martin's next HBO projects inside!