The Tech guarantee has been updated in accordance with your comments:
Customers who purchased a copy of Parallels Desktop 7 for Mac from an authorized reseller on or after July 25, 2012 are eligible to request an upgrade to a new version of Parallels Desktop for Mac at no additional cost, subject to certain conditions.
The conditions covering eligibly for an upgrade include:
Upgrade to the next version of Parallels Desktop at no additional cost if you purchase Parallels Desktop 7 for Mac on July 25th, 2012 or later – up to eight weeks after the availability of the next version of Parallels Desktop.
Must be a qualifying product as mentioned in #1 below. Not qualifying products are mentioned in #2
Must be purchased from an authorized retailer. Not authorized retailers are specified in #2
Read further:
http://www.parallels.com/techguarantee2012/