When it comes to the rollout of Android 5.1.1 on the latest and not-so-latest of Android phones, it has been slow since the introduction of Android 5.0 (also known as Android L or Lollipop). With the release of newer upgrades like 5.0.1, 5.1, and 5.1.1 in order to fix some bugs, this has left users of newer Android phones to wonder when their upgrade is arriving. This is the best we know about the Android 5.1.1 Lollipop Update Rollout Status for the HTC One M7, M8, M9 for United States carriers like Verizon, T-Mobile, AT&T, US Cellular, and Sprint. This will be good news for HTC One M9 owners, and even more good news as there is a sales at HTC for today only.
There is good news for users of the HTC One M9 as the flagship phone as the unlocked model, its developer edition, as well as the version that AT&T is offering is receiving the Android 5.1 offering today, according to Ubergizmo. If you have the M9 with another carrier, such as T-Mobile, you might have to do some possible waiting. By the way, this over-the-Air (OTA) update is pretty memory heavy at 833 MB, so you should probably do this update over Wi-Fi when you get the chance.
As for the HTC One M8, there isn't any word when users in the United States will be receiving Android 5.1 Lollipop. The news is worse of the M7 as it might not ever receive an update into 5.1 Lollipop, as two years old is practically a dinosaur in smartphone years. This is according to 2umall.com.
Of course, a lot of this information listed above might be made moot with the release of Android M this year. This is the newest version of Android that was announced at Google I/O developer's conference, but there hasn't been a formal release date of it as yet.
On a somewhat related note, it would appear that HTC is offering very large deals on its accessories. Right now, you get the Nexus 9 8.9 inch tablet at 40 percent off, the RE Camera (a small handheld camera that works as its own standalone device) for 50 percent off, and the aforementioned HTC One M9 at 25 percent off.
So if you want an excuse to upgrade to the HTC One M9, than HTC just gave you a good excuse on a silver platter. The sale at HTC can be accessed using those links above, and it ends at 11:59 PM PDT on July 28, 2015 and is only valid in the United States. So, yes, you are going to have to hurry.