ANDROID

The devices that would receive an official update for the latest version of Android are:

Samsung Galaxy S4 Active
Samsung Galaxy S4 Zoom
Samsung Galaxy S4 Mini
Samsung galaxy S4
Samsung galaxy S3
Samsung Galaxy Note 3
Samsung Galaxy Note 2
Samsung Galaxy Tab 3
Samsung Galaxy Tab 2
Samsung Galaxy Mega (it is still unclear if 5.8 or 6.3 would get KitKat 4.4)

Samsung Galaxy S3 that comes under a US contractor and contains a 2GB RAM, would get the update. This shows that the users of international versions of the device have to wait for a little longer.

Sony Devices:

The official blog of Sony Mobile had updated a list of those devices that are going to get an official update for the latest version of Android. According to the list, following smart devices are in the queue:

Sony Xperia Tablet Z
Sony Xperia ZL
Sony Xperia Z Ultra
Sony Xperia Z1
Sony Xperia Z

Google Nexus Devices:

Although Google has released Android KitKat 4.4, it is not going to release official OTA update for many of its own devices. The devices that are scheduled to receive KitKat 4.4 update include:

Google Nexus 10
Google Nexus 7
Google Nexus 4

LG Devices:

The initial list we get about the devices which are going to receive the update contains:

LG Nexus 5 (it comes with Google Android KitKat 4.4)
LG Nexus 4
LG Optimus VU
LG Optimus L3, L5, L7
LG Optimus G
LG Optimus G PRO
LG G2

HTC Devices:

The expected list of HTC devices that are the candidates for receiving the latest Android OS update is as follows:

HTC J
HTC Butterfly
HTC Droid DNA
HTC One X+
HTC One X
HTC One
HTC Desire series which was launched in 2013