I haven't tried it yet, but you can try by copying all files in the savegame folder to its counterpart on the other system.
Win Vista/7/8: %USERPROFILE%\Documents\Telltale Games\The Wolf Among Us
XP: %USERPROFILE%\My Documents\Telltale Games\The Wolf Among Us
Mac: ~/Library/Application Support/Telltale Games/The Wolf Among Us
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I haven't tried it yet, but you can try by copying all files in the savegame folder to its counterpart on the other system.
Win Vista/7/8: %USERPROFILE%\Documents\Telltale Games\The Wolf Among Us
XP: %USERPROFILE%\My Documents\Telltale Games\The Wolf Among Us
Mac: ~/Library/Application Support/Telltale Games/The Wolf Among Us