I just upgraded one of my moodle installations this weekend to latest 1.8.2+, lot of fun till the morning hours :(, but right now its working again correctly. I hope :).
One of the things i noticed, that the Guest can view users profiles. And i don't like it. It is like showing my users naked, therefore the title ;-). I think this was not possible with older version by default.
So after some searching, i found solution. It's forceloginforprofiles
and you can find it in
Administration -> Security -> Site policies
In this way you force Guests to login as a normal user to see the profiles with emails and others informations of user of your site.
I think i protect my users privacy little more with this settings set to on.