The Paciello Group, who do a variety of work in the accessibility arena, are conducting a survey on mobile accessibility. Details on the survey page indicate that the results will be publicly available in a tabulated format and are intended to assist people in understanding where to direct focus around mobile accessibility.
The survey asks 15 questions around many of the basics you might expect. Topics covered include, devices used, operating systems used, sources for learning about accessible mobile apps and pages and some high level biographical information. The survey takes just a few minutes to complete so consider filling it out.