The newest version of Android is tied with Froyo (Android 2.2) for market share
A quick visit to Google's Developers Dashboard for Android reveals that mobile device makers and wireless carriers alike are dragging their collective feet when it comes to embracing Android 4.4 KitKat. After three months, KitKat has inched its way onto 1.4 percent of all Android devices, barely edging out Android 2.2 Froyo, which claims a 1.3 percent share of the market. Meanwhile, Jelly Bean (Android 4.1.x to 4.3) is picking up most of the slack with a 59.1 percent share.
What that effectively translates to is Jelly Bean being installed on around 6 out of every 10 Android devices and KitKat being found on a little more than 1 out of 100 handsets and tablets. The good news here is that Jelly Bean is an excellent build.
Even better news is that this is Android we're talking about, and in most cases, if you have the time and desire, you can root your handset and plop a third-party KitKat ROM onto it. Rooting Android isn't quite mainstream yet, though it's closer than ever thanks to the efforts of the CyanogenMod team and their aftermarket firmware for almost every Android device under the sun.
If you're not interested in rooting, the advice is the same -- hang tight, provided your handset maker is planning an update to KitKat. HTC One owners, for example, should see a KitKat update soon, if not already (try manually checking if your handset didn't pull it out of the air automatically).