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Seems that using F12 to review changes quietly skips over changes to import blocks. Now clearly these are "less important" changes (so long as the source still compiles!) that are less likely to be controversial, but it would still be nice to look at them to verify that nothing funny is going on. I'm not sure, but it looks like sometimes the import statement changes appear as part of the same change (acc. to the top pane) as a change to a method (the last such change in a given class)? If true, that is pretty weird - would expect a separate entry in the top pane for changes to imports.
The old Jackpot module is no longer maintained. There is a rewrite in progress at: http://bitbucket.org/jlahoda/jackpot30/wiki/Home