Does installing the Dev Preview automatically enroll your phone in the feedback program? This program is found under Settings as "feedback" in WP 8.
I don't know what information is send to Microsoft, but yes I found it enabled after installing windows phone 8.1 developer preview on my Lumia 920. You can always disable it by going into phone settings/feedback
You can also disable it on windows phone 8.0 , it sends information only on a wifi connectionOk. I didn't know if information was automatically collected and sent to them, kind of like some beta programs require.