I'm an international student from Canada and I was really worried about this stuff as well, since our province doesn't even begin to send out transcripts until tomorrow (08/02). I talked to Lin (admissions advisor) about this and confirmed with her many times that our enrollment will not be affected. She explained to me that Cal understands international transcripts will be arriving much later, and that as long as our transcripts arrive at their office eventually, we are fine.
As for the email you recieved, she explained to me that it is an automated message that the system sends out to all incoming freshmen who's documents have not been processed yet. She explained that if you are an international student, you can ignore the email, as they understand your transcripts will get there eventually.
I don't know if that helps or not, but my understanding is that they realize some of us coming from out of state (or even out of country!) will be getting our documents to them at a later date.
Hope this helps a bit