Yesterday the European variant of the HTC One M8 got the Android 4.4.3 update with a minor GPS fix, and the Android 4.4.3 seeding continues on the Indian flavor of the HTC One M8. In addition to the new OS version, the One M8 for India gets support for 4G LTE networks, connectivity optimizations, and updates over default Sense apps Camera, Gallery, Settings and Sync Manager.
The update also improves on the BoomSond, Motion Launch and Extreme Power Saving Mode. If you are using the HTC One M8 for India, your update should be waiting for you already. It s size is about 660MB, so it will probably take a while before the download process finishes.