I doubt that. A Chapter 11 filing automatically stays all actions unless an order allowing the action to proceed is obtained. That means Lucasfilm's action is dead in the water until the Bankruptcy Judge orders otherwise. So while there are reports from the Trustee and creditors in the estate can obtain information, the sort of discovery in the Lucasfim action you envision will not occur absent an order to the contrary. (There will be an accounting though.)
In a case like this, given the relatively modest amounts in issue, I doubt that anyone at Lucasfilm will seek such an order in the Bankruptcy.
But sometimes, when the fight is about something other than money, the matter goes differently. For example, if the Make-A-Wish allegations are true, and George Lucas is genuinely pissed off and decides to take it personally, he can raise hell in the bankruptcy proceedings and the debtor can end up far worse off than they ever thought they would be. That assumes the creditor is out to punish the debtor and teach it a lesson - never mind the ongoing financial costs to doing so. George Lucas certainly has the financial wherewithal to pursue that strategy should he choose to do so.
Bankruptcy can be a very ugly process when there is a creditor of the estate that wants to make it difficult for the debtor and is prepared to pay the money to the Trustee and to its lawyers to make it so. In the vast majority of cases, the creditors do not pursue these avenues of relief as it makes no financial sense to do so. That is not the same thing as saying it can't happen, however.
I've seen many defendants make an assignment in bankruptcy thinking that the pain is all over. Then they find out the creditors are not of the same view - at all. It's rare though.