In 1983, Microsoft first announced their "Windows" software, which ran on top of MS-DOS, in direct response to VisiCorp's Visi On desktop software. In 1985, however, it had still not yet been released, there was still significant work to do, and most were now calling Windows "vapourware".
So, what did Microsoft do? They took the existing beta (with a few enhancements), slapped the phrase "Premiere Edition" over top of it, and sent it to some key developers. Then, once Windows was finally released, the original "Premiere Edition" was completely forgotten about.

Like a lot of forgotten software, it quickly became the source of much speculation, and many sought after it. Someone even took it upon themselves to create and upload a fake version, and even with the obvious inconsistencies people accepted it as the real thing.
Until someone released the actual real thing.

The Premiere Edition splash screen, which looks identical to the one in the final product.

Here is the desktop. As you can see, even in VGA mode it defaults to a monochrome pallette, similar to the existing beta releases.
Drivers for Premiere Edition are all in EXE form, like the betas. Unlike the betas, and also unlike 1.01, the core Windows file is called "WIN100.MID", where it was an EXE and a BIN file in the betas and 1.01 respectively.

The control panel is completely different from the betas, and looks more like the one found in Windows 1.01.
It is missing the "Add New Font" and mouse settings, though.

Here is Paint, which appears to be complete.

Here is a look at a dialog box, which is more in line with the final release than any of the betas were.