Motorola has already started rolling out the Android 4.4 KitKat for Moto X, HTC and Sony has shared their update plans, and LG and Samsung are yet to give their statement regarding this update. If newly leaked schedule is believed to be true, then Samsung will be updating its flagship smartphones soon to KitKat.
According to the leaked schedule, Galaxy S4 and the Galaxy Note 3 will be getting KitKat in January 2014, whereas the Galaxy S3 and Galaxy Note 2 will be getting the same treatment in March or April 2014.
There is no way to confirm the legacy of this document, until Samsung give any official announcement. So, its better you take this news with a pinch of salt.
Source - iTechAddict
Via - GSMArena