FNM have announced on their website they're playing Reading on the Friday and Leeds on the Saturday, despite Download claiming them as an exclusive.
Some people are suggesting they will play mainstage between KOL and Kaiserchiefs, but I think NME stage headliner is more likely. There was an interview with one of the Reading organisers on the night of the original line up announcement which gave a very strong hint Lost Prophets would be announced the following week as an NME headliner (which happened) which also said they would not be able to announce the other headliner for a very long time (e.g after Download), and that it would seriously embarrass one of the other festivals when they did. FNM fit the bill perfectly.
Reading just got better! I wonder how many people who turned their back on it this year will be kicking themselves when the full line up is eventually released?