I'll probably tell some more stories about Dunk and Egg one of these days, but most likely not for a few years. I still have thousands of pages in my current series to write first.
I hate "What Has Gone Before" summaries. Instead, I tried to write the opening chapters of A CLASH OF KINGS in such a way as to jog the readers' memories of all that happened in A GAME OF THRONES. There's also the geneologies to help keep things straight.