I googled it up, and from the dates on news reports, it looks like it's been stuck in "ready for testing" limbo for months and there are zero meaningful specs or details on the drone itself published.
I also found Tim Berners-Lee trashing the buisness model, and philanthropist Bill Gates pointing out there are more important problems to solve in the developing world before connectivity.
I didn't think I could be more negative on Facebook's shitty internet.org, but now I am. Thanks for encouraging me to do the research!