Roku streamers pop up at Walmart, could a Vudu channel be on the way?

Zatz Not Funny points out the Roku XDS and XD streaming video players have popped up for sale on Walmart.com. Following the usual Walmart pricing they're a buck under the usual MSRPs, but the more interesting question is whether this portends the arrival of the (Walmart-owned) Vudu as a channel on Roku devices. It only makes sense Walmart would want to get its service included before these boxes make their way onto physical shelves, but we'd be more surprised if we didn't hear something before the Walmart star appears on Roku's official retail partners page.