This weekend version 1.4.3 of jQuery was released. One of the biggest improvements from my point of view is the new and up to 20% faster .css() function, which now also supports adding custom CSS properties using jQuery plugins. Also the faster traversing using .closest(), .filter(), .find() and .is() seems quite promising.
Read about the all of the new additions and improvements in the updated jQuery 1.4.3 documentation.
Exposure is out of the box compatible with this latest update, so for the next release I will bundle Exposure with jQuery 1.4.3.