I'm a little speechless, but getting my bearings again.  Just "test" upgraded our Framework from 1.3.2 to 1.4 of the jQuery core.  We have over 40 plugins/controls/custom jQuery based scripts (350k uncompressed) built into this MVC framework and I was hesitant to push the new code (although, in reality, it took about 5 minutes to redirect to the new library and run through things "at a glance").

NOTHING stands out as an issue... no errors, no misplaced elements, no failures on rendering. 

I thought for sure jqGrid (as large as it is) might hiccup in some manner just due to it's complexity, but nada thus far. 

Kudos to the jQuery Team for this!

Having said that, has anyone run into upgrade issues that they might share?  As I get into the testing more, I will post here.