I'm co-organizing an upcoming workshop for MobileHCI this year. It is on the topic of "Informing Future Design via Large-Scale Research Methods and Big Data". It is loosely based on previous workshops I have co-organized on Research in the Large. This year it goes beyond evaluation and instrumentation of app stores (which in my view have been a big theme for the previous workshops) and looks at how we can find new ways of incorporating large deployments as means to inform design. This means not only to iteratively improve existing systems and design ideas, but to use it in the ideation process of new ideas.
The deadline for the workshop submission is on May 10th and MobileHCI will be in Munich on August 27-30th. Check workshop web site for more info.