Windows 7 is not available to purchase at retail, officially, but system builders are still allowed to integrate it into their PCs until at least October. At the same time, Windows XP is nearing its end of life of April 8th (the day of its last security update). A third coincidence, modern Windows could easily be compared to modern art because it is made by someone who tells you what is legitimate and, when you actually attempt to admire it, makes no sense unless the designer explains everything.
If you purchase from a set of select new desktop or laptops, HP will ship it with Windows 7 installed by default. On top of needing to physically choose Windows 8.1, the default Windows 7 install also comes with a $150 USD discount. The models are spread between Pavilion and Envy desktops and laptops.
I believe this is a very smart move for HP. You may soon have a mass of customers looking to replace expired devices and they may want the closest analogy to what they are used to. They will still have Windows 8-based options but they want to capitalize on anyone looking for something else.
Personally, trolling aside, I actually do not mind the interface of Windows 8.1. My only complaint is the reliance upon Windows Store and its potential future problems especially if it becomes the only way to install software. Could you imagine if someone like the NSA forced Microsoft to not certify encryption apps (or worse, tamper with them)? One of a million problems that mandatory certification, and the interest groups who abuse it, brings.