So you have a product tested successfully on pre-release versions of Windows 7, and a bunch of other very exciting features that Acronis has not even thought about. Yet it will still take another couple of quarters to get the product out.
By then, your hope that Acronis and others have not thought of these features may prove to be incorrect and you will be playing catch up. Every company has new features in hand for a new release, and there is a compelling logic to introducing updates to existing versions to support Win 7 and then bringing out a totally new version a few months later to get new revenue streams from their happy users, who did not have to wait forever for official Win 7 support.
Although you say that GSS 2.5 will be suitable for Win 7 migration - is this a position that the Symantec support departments share? If a GSS 2.5 user rings up with a Win 7 problem, will they be able to actually offer any help, or will they fall back on the position that "GSS 2.5 does not officially support Win 7". If the latter, then the suitability of GSS 2.5 for Win 7 migration is frankly meaningless.
So Eugene, lets have a formal commitment from Symantec about Win 7 support for GSS 2.5