Oh hey! Look at that. My mobile data is gone too. Didn't reboot after the initial install and I was home all evening yesterday on wifi, so I didn't even notice.I'm only seeing faster battery drain. I updated to DP2 and lost mobile data. Icon showed LTE but signal checker said no service. Had to reboot.
Mine's not even saying LTE. Rebooting now.
EDIT: Rebooting seems to have brought mobile data back for me as well.