Good news at first. As one of our sysops from Beijing, who also sent the pitition for lifting the block this time and in the last times, reported, the block is lifted. All WikiMedia-projects should be reachable from China in the coming days.
They left the main page editable didn't they?
No, one can only edit if one is registered. In some internet forums someone said they simply didn't impliment any security measure. :-O
Ting