I feel the same way. When I was considering the purchase, I specifically asked the Sales department if they were planning to bring out a version 12 soon, because I would prefer to wait for the new version if they were. They emphatically told me "no," and that even if they did, I would be covered by the Tech Guarantee.
Then, less than 2 months later, what happens? You guessed it! Parallels comes out with a new version, explicitly contradicting what Sales said about a new version, and not only that, but the Tech Guarantee only covered me if I had purchased in the previous 2 weeks or so, which is a shorter time period than even Apple gives.
I feel like this is a very underhanded business practice, and puts a very bad taste in my mouth regarding the consideration of future Parallels purchases, and just rubs salt in the wound that I can't get rid of this spam when I did everything in my power to make sure I made the best decision possible - unfortunately, you just can't easily protect yourself from insider misinformation...