[Werthead]

Wylla is a serving woman at Starfall and apparently a confidante of the Lady Ashara Dayne. She isn't 'random' at all. The mix-up between some people thinking that Ned and Ashara had an affair after they met at Harrenhal before the war, and Robert thinking that Ned slept with Wylla, is I think a major clue that something is seriously wrong there. There are secrets to be revealed.

George has said that the 'third' head of the dragon doesn't need to be a Targaryen (whethere this implies that the other two need to be is unclear). The dragon having three heads is also possibly a reference to the three people who will retake Westeros for the Targaryens, or the three people who can control the dragons. It's not necessarily the case that the three heads need to be in a relationship with one another. The third head is therefore popularly believed to be Tyrion, with Jon and Dany as the other two.

The other possibility is that Aegon VI Targaryen, the infant son of Rhaegar and Elia, survived the Sack of King's Landing. This is supported by some textual evidence and also by GRRM's comments emphasising that Rhaenyra was killed but not mentioning Aegon. Aegon VI would actually be the rightful king - he comes before his aunt, Daenerys, in the line of succession - but proving who he is would be difficult after all this time.