A: The Process Composer is the only tool which allows you to create and edit web forms. However, the definition of the web form is part of the composite so you can find it under the /forms directory after you export the project from Composer and import it back to JDeveloper. You cannot edit it or even see it while working in JDeveloper though.
Q: What other features, besides Process Player, are available in the Process Composer, that would make it the preferred solution over JDeveloper?
A: The Process Player is the main and only feature which is available in Composer and not in JDeveloper. On the other hand you can create the ADF forms only in JDeveloper and not in Composer. I would suggest then that you stick to the original target use cases for both tools. Business Analysts better go with Process Composer Process Developers better use JDeveloper.
Q: Can the process player work with ADF pages? A: Yes, it works with both Web Forms and ADF TaskFlows.
Q: I had problems with finding documentation for the current release. Could you point me to some resources like tutorials, samples etc?
Oracle BPM Suite 11g Highlights - http://youtu.be/HXhWpu17N6c
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