A new Samsung developer document may have accidentally revealed Android 4.4.3 KitKat is coming soon.

The troubleshooting guide references issues with the ConsumerIrManager before Android 4.4.3. This implies Samsung has early access to 4.4.3 for optimization.
Google has not officially announced a 4.4.3 update yet. But Samsung confirming a pre-4.4.3 Android version indicates the incremental update’s release is imminent.
Android platform versions typically go through multiple internal iterations before public launch. 4.4.3 likely fixes bugs and refines features ahead of a wider rollout.
Samsung ensuring its IR capabilities function properly with 4.4.3 provides the first solid evidence of the update’s impending debut.
Of course, the company has not shared any timeline for 4.4.3’s launch. But if Samsung documentation references the update, its launch can’t be too far off.
4.4.3 will likely deploy first to recent Nexus and Google Play edition devices before hitting Samsung’s Galaxy smartphones. But behind the scenes, Samsung is already preparing to support the latest KitKat refresh.