What exactly does KB2952664 do?

The description Microsoft provided with KB2952664 states this:

This update helps Microsoft make improvements to the current operating system in order to ease the upgrade experience to the latest version of Windows.

Microsoft needs to answer these questions ...

1. Exactly what is wrong with the current upgrade experience that warrants a fix to ease the upgrade experience?
2. In what ways does KB2952664 improve the process of upgrading to Windows 8.x??
3. What impact/consequences would one experience by initiating an upgrade to Windows 8.x without previously installing KB2952664?
4. If KB2952664 is needed to upgrade, then why not just have the upgrade process itself automatically pull in KB2952664 at the point in time that a user upgrades?

KB2952664 is just about a year old, and I suspect that Microsoft will never answer the above questions.

I will never install Windows 8.x on any of my computers (and thus never install KB2952664).

The description Microsoft provided with KB2952664 states this:

This update helps Microsoft make improvements to the current operating system in order to ease the upgrade experience to the latest version of Windows.

I will never install Windows 8.x on any of my computers (and thus never install KB2952664).

Hi, I try anything new at the home office before allowing it near my business; windows 10 is good as it made my old PC run much faster and more smoothly, but couldn't stomach the Metro Interface on a none touch screen computer. Cured it using Classic Shell free download, (Google it) now got best of both worlds, classic desktop and controls, W8 speed. Tried 10 but too many things to tweak so will wait until sorted and Classic Shell catches up. Windows 8.1 has the start button back thank goodness.

Chassis of Windows 8.1 & 10 is good, just the arbritrary decision to force a brand new set of controls on us all with desktops when this disrupts too much of our business was utterly wrong.

If I had to guess, this is a piece of software to determine if your Windows 7 is a counterfeit.  As you probably know, they will be offering FREE upgrades to Windows 10.  If they determine that your version of Windows 7 is bogus, they will not allow updates of any kind when you update to Windows 10.  Just my two sense.

They're offering Windows 10 to everyone, including pirated copies of Windows 7 SP1, 8, 8.1.

What is really annoying is that if you have auto update then every time you shutdown  you have to wait while it updates and then when you start up you have to wait for it to configure, then fails and reverts twice, wasting yet more time.