Nah, 2 or more time interns (only in the US, at the moment? Wasn't the case in Sydney, but was for a friend in Seattle) can get a FTE role if they have really good feedback from t heir internships.
If so, it's not publicized internally. I interned at Google this summer too, and I didn't hear anything about how I could bypass conversion interviews. Maybe it's a case-by-case discretion thing.
