While Samsung is yet to push the official Android 5 Lollipop ROM for the Galaxy Note 10.1 2014 tablet, folks at XDA have released a custom firmware based on latest P905 ROM. What’s more? It is De-KNOXed, Pre-applied CSC.
The name of the ROM is Besonderes which is a Touchwiz Lollipop ROM for Galaxy Note 10.1 2014 LTE, ROM for the Samsung Galaxy Note 10.1 (2014 Edition). To install it, just do a Factory Reset and flash the ROM via odin. Download links are given below.
Keep in mind that this will void your warranty so if your tablet is still in warranty, it is better to wait for the official Android 5 Lollipop ROM than going for this. That said if your warranty is already void, there is no harm in installing it as it is a pretty solid ROM.