You often wonder why it takes so long for an Android update to roll out, even though Google's made the iteration official months back. This can be a complicated thing to explain, but more often than not, the culprit is the OEM; customizing the Android skin along with its proprietary features is what makes companies take so long to deliver updates to you, the end users. Of course, a lot of testing is involved as well, which again takes a lot of time and acts as a bottleneck in pushing updates. At times though, such as in the US market, network carriers have specific variations of a particular model which means there's even more time to be vested in order to make the update go live.
Samsung has already been rolling out Android 5.0 Lollipop update for its Galaxy S5 in certain regions in Europe, but the update is yet to show up in the US market. According to reports, however, a Samsung rep has conceded that the company is pushing US carriers to make the Lollipop update official soon. And, this is not only for the Galaxy S5, but also the Note 4, Note Edge and some of its older models, including the Galaxy S4 and the Note 3. While we can't confirm a timeline as of now, it wouldn't be wrong on your part to expect a Lollipop update soon, given you have any one of the above mentioned phones.
