While responding to a question about firmware updates, Peter Dille, Sony's Senior VP of Marketing, wandered onto the topic of in-game XMB himself:
"As far as in-game XMB access, we know it's a feature that's important to our consumers. Because PS3 packs so much advanced technology 'under the hood,' it takes some time to implement major, new functionalities, but we are working hard on addressing this feature, as well as continually expand the capabilities and functionalities of PS3."