You really don't know what you're talking about, do you?
Windows 7 has a whole architecture set up to let apps use HiDPI elements and display at any arbitrary DPI you might choose.
See this.
If the developer has chosen to include calls to the HighDPI user interface (which were available in Windows Vista, too), then their programs will run with high-res visual elements. If not, then Windows will scale low-res screen elements the exact same way that 10.7 does on a new MBP Retina display.
The difference is that you can pick whatever DPI you want in Win7. There are some defaults (the highest default is 144dpi), but you can edit those to be anything (including 220). Windows 8 will apparently be just fine with the Retina MBP out of the box, per
AnandTech.