It was obvious that 128-bit operating systems would be rolling out sooner or later, but the only question was who and when. First, of course, we'll need to have 128-bit processors available to the general public, not to mention other compatible hardware and drivers, but there is plenty of time for Intel and AMD (let's not forget ARM who are making strides in their market) to duke that out on the processor field.
The information found that suggested 128-bit support by Windows 8 and/or 9 was in a LinkedIn profile of a certain Robert Morgan, who happens to be from Senior Research and Development at Microsoft. The information was afterwards taken down, but luckily it's been preserved on news sites such as OSNews:
Windows 8 News, which first discovered Morgan's profile, now claims to have secured an interview with him and is having its readers submit the questions. You, too, can participate, so meander on over before October 11th to do so. There is only one question thus far as of this article's publication, so go show your OSNews spirit with intelligent queries worthy of science academies worldwide.
Overall, this doesn't mean we can expect to see Windows 8 to appear with 128-bit support, but it's for sure in the process. This also brings up the theory that maybe Windows 7 could be the last OS in Microsoft's arsenal to have a 32-bit version. As Windows 7's outlook is much better than Vista's was and still is, it's not hard to come to the conclusion that the release cycle between 7 and 8 will probably be longer than just three years, so this has plenty of time to brew. Also, who's to say that Apple doesn't have anything 128-ish being put together behind their iron curtain of mystery?
Time will tell.