Heard back from PTC on this easy question: Pay close attention to the word "planned"
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IE9 is planned to be supported with Windchill 10.0 M020 and with all 9.1 releases
The following Pro/ENGINEER versions are planned to support Internet Explorer 9.0:
* Pro/ENGINEER Wildfire 4.0 M210
* Creo Elements/Pro 5.0 M110
* Creo 1.0 M010
Google Chrome is planned to be supported with Windchill 10.0 M020.
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Thanks to Ben Loosli at USEC and Josh Houser at Schneider Electric for comments and insights.
Paul J. Crane, PMP
Team Leader, John Deere Global IT PDP Modeling Solutions