SharePoint Server 2010 will not support Internet Explorer 6. Users will have to use Internet Explorer 7 or above. However, non-Microsoft browsers such as FireFox 3.x (on Windows & non-Windows platform) and Safari 3.x (on non-Windows platform) will be supported.
The Office 2010 beta will be available in July, but SharePoint Server 2010 beta will not be made available at that time.
Enterprise Search in Office 2010 has been improved, with Microsoft’s recent acquisition of Fast Search & Transfer.
This information was revealed during the TechEd conference.