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Reports suggesting Motorola is working on a mysterious new upgrade for its Xoom series of tablets has led to fresh speculation of an Ice Cream Sandwich update.

The hopes of an upgrade to the Xoom series operating system emerged after Motorola posted a message on its forums indicating it was working on a new "confidential" project.

"Thanks for joining the Motorola Feedback Network. We are preparing a project for owners of the 'Google Experience Device' version of the WiFi-only Motorola Xoom. (This is the U.S. version only.) If you own this particular model, we would like to invite you to participate," read the Motorola post.

Though the offer is currently only open to U.S.consumers, numerous research groups have since speculated that the mysterious new project will be the Ice Cream Sandwich update promised to Motorola fans earlier in 2011.

Ice Cream Sandwich is the latest version of Google's Android operating system. The OS was unveiled alongside the new Galaxy Nexus smartphone in Hong Kong in October 2011. For a full look at the OS and its new features check out the International Business Times UK's "Nine Key Features to Look Out For" and Galaxy Nexus review.