One of the great things about researching Agile is, given the scope of both its applicability and effects, you'll never run out of interesting topics. Agile product management, Agile used outside development, contract details in Agile projects, Agile channel management, the effect of Agile on requirements—researchers like myself and Dave West, writing about Agile directly, will have plenty to do for years to come. So, too, will others, like Mary Gerush, exploring the effects of Agile on requirements and other aspects of development.
As Agile goes mainstream, video game developers like Bioware have taken the Agile plunge. This corner of the technology market is very interesting because of the high level of challenge. In some cases, video game developers face extreme versions of common problems, such as an unforgiving standard of product quality. (Ship a crappy product, and your dreams of making obscene wealth will be replaced with the nightmare of watching your game vanish from retail channels.) Other challenges are unique to the video game industry, such as managing all the creative talent—artists, musicians, and actors—critical to product success. (But heck, if you get to meet John Cleese, Claudia Black, or Gary Oldman, the work can't be all bad.)