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.
New lightweight Windows export option; new examples; bug fixes
New examples, mesh editor improvements, bug fixes
New examples, touch/pen input improvements, lots of bug fixes
More bug fixes
Bug fixes
New examples; Cordova updates; bug fixes
Bug fixes; pen updates; more JavaScript features
More new examples; bug fixes
Mesh editor; new examples; bug fixes
Hotfix for r227