Samsung has teased a photo document dated 23 October 2013 wherein it shows the Android 5.0 update which is under testing phase. The Korea based smartphone giant is yet to comment on which devices will be receiving the Lollipop update although various manufacturers have said that their flagship phone be receiving update on so and so date.
The Galaxy Note 4(SM-N910I, SM-N910F) andGalaxy S5 (SM-G900I, G900F) Lollipop update is currently under testing and for Galaxy Note 3, Note 3 LTE the update has been approved with ETA been said as February 2015. the Galaxy Note 3 Neo SM-N750 Lollipop update is not finalized according to the document.
The image also provides notes that Lollipop update for Galaxy Alpha SM-G850F has also been approved and Galaxy S4, S4 LTE is still awaiting approval.
This however happens to be incomplete list and only lists the global variants. What about AT&T, T-Mobile, Sprint, Koodo Mobile or any other telecom operator brand phones. That info is missing out here.