"Today, a few Avatar items appeared with an option to purchase with local currency, instead of Microsoft Points," a company spokesperson told Joystiq. "This display error doesn't signal a change in payment options, but rather an error in how the offers were configured in our services which resulted in an inconsistent experience. It is in the process of being resolved."
Initially it appeared this conversion was the beginning of the rumor from earlier this year that Microsoft would do away with its space bucks in favor of real currency. But, that simply seems to not be the case at this time.