If you are planning to upgrade to PeopleSoft 9.2 AND PeopleTools 8.55, there are changes in the upgrade process.
First, the PeopleTools upgrade is now a separate step. In the past, you could upgrade PeopleTools and the Application in one pass. Starting in 8.55, PeopleTools will be a separate pass. If you look at the FSCM 9.2 upgrade page, the 8.55 upgrade template has only the Application steps. To upgrade PeopleTools, you will generate the upgrade template from Change Assistant.
Second, the databases used in the upgrade process has changed. You no longer use a Copy of Current Demo to create the UPGCUST project. Instead, an app engine will create the UPGCUST project. The app engine will compare the LASTUPDOPRID for the objects and if the user is not PPLSOFT it will be added to the UPGCUST project. One impact, if you’ve deleted delivered objects from the system, you won’t see those in the compare report. (Not sure why you would do that, so this shouldn’t be an issue for you).
Third, you also need a PeopleSoft Image database for the Initial Pass. When you generate the Application Upgrade job in Change Assistant, you will also get a separate change package with all the Required for Upgrade fixes. These come from the PeopleSoft Image. To get a picture of how the new upgrade process works, the PeopleTools 8.55 PeopleBooks has a diagram on the process.