Samsung added some tempting software features to Galaxy Note 3, and we name these features as one of the main reasons which is worth upgrading from Note 2 to Note 3. The question is how to get Galaxy Note 3 Features on Note 2, so you don't have to change note 2 for this very reason?
There is no official news from Samsung regarding this issue, and so you have to use custom ROMs to get Note 3 features on your Note 2. XDA members developed a reliable custom ROM with the minimum errors and bugs (of course you shouldn't expect a flawless functionality), and by installing this ROM on your Galaxy Note 2 you will get the following Note 3 features: Air Command, One Hand Operations inside Settings, and many more
To know more about this Custom ROM, and the way to install it, go to Developer's Thread on XDA Forums.
Note that installing Custom ROMs has its own risks and make sure you know all the way through before installing.