Since I have a lot of faith in the people who manage GIM, I would not get excited about this change. I would guess that the use of currency derivaties would allow the manager to create synthetic positions in bonds where buying the actual bonds is either impossible, expensive or undesrable. For example, suppose you want Euro exposure but don't actually want to buy a specific sovereign in the EU. You might buy a US corporate bond, pair it up with a EUR currency forward and synthetically create a Euro denominated bond that does not have direct exposure to any of the EU sovereign credit names.
"All animals are equal, but some animals are more equal than others."
- George Orwell