I've been addressing this by customizing the Task Form Templates (WC 10.2 M020). Guide and Help Center have some good info to get you started. I've ben working with Change Management and including Affected and resulting Objects tables in Task Forms so you can directly access data from the Task. In 9.1 I think you can include the entire Info Page to the effect of embedding the PBO in the Task Form. I'd be surprised if you can't include data elements from a Promotion Request.
I want to say I recall some indications from "the mother ship" (PTC) that an upcoming release (not sure if it's 10.3 or 10.2 @ M030) will make this much easier.
In Windchill 10.2 M030 we are adding a new capability called User Focused Task Pages - with this capability an administrator can configure a Workflow Activity with attributes, actions and tables from the Primary Business Object (PBO) of the workflow - the item which the workflow is against. This can be configured againtst any object.
The tables will enable you to see and work with data from the PBO. Below is an example of a Table from a Resulting Objects table showing the actions one can do right from the Workflow Activity
There will be several OOTB workflow Activity Templates available for Change and Promotion that are provided - but since this is an MOR you will need to configure them in - we cannot insert them automagically.
Will we still be able to leverage custom task forms? Others have discussed adding hyperlinks to external targets for things like instructions on completing a WF Task and I'm wondering if this will still be possible or if an alternate approach needs to be looked at.