Wow, you look away for 2 seconds, more news for the IDW panel, currently underway here at NY Comic Con.
The character of Illyria will be crossing over to another title called "Fallen Angel: Reborn". Apparently, this is the first time anything has been done this way and they had to get special permission from Joss Whedon to make this happen. The story will take place during season 5 after Illyria had lost her powers. She goes on a journey to get those powers back.