With the release of the notes from the "PHP Developer's Meeting" that just happened, the Professional PHP Blog has their own take on it today.
I've also been impressed with the new upgrade notes for 5.1. Good job there, too.
Derick Rethans has posted the notes from the recent PHP 6 meeting in Paris. All I can say is wow! PHP has a bright future. Good job guys.
He does note, however, one issue that "jumped out at him" - their deliberation as to whether to have Unicode support on or off by default. He also mentions one thing that might be useful (or might not depending on how much data you get) - simply asking the hosting providers what they'd want...