[4.4] Android KitKat is made to run on OUR old phone!!
Google released nexus 5, and as you know it contains the brand new Android version KitKat.
Apperently google has make it compatible with old phones (such as ours) even those with as low as 512mb RAM.
It uses 60% less memory than JellyBean!
So let's just wait for the sources to be released