Adam recently posted information regarding the Targaryen Conquest on the Wertzone:
From readings at two conventions, George R.R. Martin has revealed the full story of Aegon the Conqueror's invasion of Westeros and the subjugation of the Seven Kingdoms. This material (not yet 100% finalised) will form a small part of The World of Ice and Fire, due out in late 2013.
Adam's piece is broken down into three different parts: Before the Doom, Before the Conquest, and The Targaryen Conquest.