If you're interested in cutting edge Construct features try the Beta releases. These releases should not be used unless you are willing to tolerate some bugs.
Firefox support, Xbox Live leaderboards, updated data editors
Extended 'Find all references', 'Go to function' and more
Some language updates and more bug fixes
French translation, rgbEx expression, lots of bug fixes
Bug fixes, new manual, MP3 support
GPU profiling, new theme, optimisations and more
New IAP plugin
Additions and SDK updates
New Export Manager, updated effects engine, more fixes
Some new additions