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The expansion {,} in bash will repeat the given string once for each item seperated by commas. The given command will result in the following being run:
cp /really/long/path/and/file/name /really/long/path/and/file/name-`date -I`
These can be embedded as needed, ex: rm file{1,2,3{1,2,3}} would delete the files file1, file2, file31, file32, file32, and no other files.
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Very cool. I'm pretty sure that the comma is not expanded: it's the empty string that it delimits.