Yeah, after 30 days you have to log on again. Then you can use guest another 30 days.
I do in fact remember hearing that now. Compared to the crap they saddled Diablo 3 with it is inoffensive and unobtrusive and not a big deal. I am holding out hope they don't have an always-on mandate with the next SC2 campaign but given how far gone Blizzard is I expect to be disappointed.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.” - Mahatma Gandhi