Android 4.4.3 is said to be in works, and is expected to roll out for Nexus devices in the coming weeks. If you remember, a Samsung handset with SM-G906 model number was spotted on AnTuTu benchmark, said to be a variant of the Galaxy S5 Prime, running Android 4.4.3. Now, the upcoming version of Android has been spotted on Samsung's developer website, which shows a workaround to solve issues with the ConsumerIrManager for devices running anything below Android 4.4.3. The details about Android 4.4.3 are pretty scarce at the moment, but it's still a good thing to see that Samsung is cooking up the new update and could be the first manufacturer to roll it out to devices.
We'll update you as soon as we get any information about the rollout of the new update for Samsung handsets. However, since Android 4.4.3 is expected to be mostly for bug fixes for Nexus devices, don't expect to see anything noticeably new.