Android 4.4.3 due to come out today (6.2.2014) - so says T-Mobile
http://support.t-mobile.com/docs/DOC-5034
Doesn't matter. OTAs for 4.5 could drop right now to a hundred thousand phones and it still wouldn't matter. What matters is source. When the AOSP source is updated to 4.4.3, then something can be done about it.
Sent from my Slim Nexus 5 with smoothness by Faux.