Yep, checked it out and you're right.
DP 1 = June 13th
DP 2 = July 5th
PB 1 (DP 2) = July 7th
DP 3 = 18th July
------
Nonetheless I find it odd people say things like "DP3 of a major new iOS release has never been released less than 4 weeks from DP1, since iOS 4"
when we could also say a PB of a major new iOS release has never been in June. Yes, we know it will this year, because Apple told us- exactly! It's a 'rule' from previous years that they're 'breaking' - a trend from previous years that doesn't guide us this year. We're fortunate to know this one in advance. Other trends could be just as flimsy.