This is a bit confusing, but in essence there are two different game versions in play.
One of them being the MCPE version, and the other being the Windows 10 Edition version. The current Windows 10 Edition version is 0.12.2.0 and the current MCPE version that the game is using is 0.12.0(.1).
The blog post was updated to use the MCPE version, although I find that a bit deceiving. You can check the current version you are on by right clicking Start and selecting "Command Prompt" -- use the following command:
powershell Get-AppxPackage -Name Microsoft.MinecraftUWP
It should state "Version: 0.12.2.0" and if it does, you have the latest update. The game updates automatically.