Speaking to Game Informer, Sony's Peter Dille revealed that the company understands in-game XMB access is a feature important to their consumers. But as the PS3 is so advanced it takes time to implement major new features. However, he reassures us that the team is working hard on this feature as they continually evolve the feature set of the Playstation 3 console.
"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."News Source: PSU.com