Hmmm... I think it might be a bit early.
Give Aarons Avenger run and Strike Force a bit of time to raise his profile and maybe use him more in a couple big events so that people will perceive him as more of an important character.
I definately think there should be some material on the shelves before the movie comes out ... but I still think there's a bit of time to try and raise his stock a bit so that the solo book will have a better chance of attracting an audience.