Ok from the hdguru webpage
"Like other series in the Vizio line, the Reference models feature a full-array backlighting system, but with the most LED lighting zones (384) of all the lines. When available the Reference Series will include 65- and 120-inch models (pricing has not been disclosed). Vizio wasn’t prepared to discuss retail distribution plans for the new high-end TV line, but a company representative said the advanced nature of the technology makes it an unlikely initial fit for the brand’s traditional class of mass merchant retail partners, like Walmart, Target and warehouse clubs.
Traditionally, Vizio has stayed clear of smaller retailers, like specialty electronics stores that typically have the ideal sales support to launch advanced new product technologies like HDR and wide color gamut, so it will be interesting to see how the company takes the Reference line to market. Additionally, the 120-inch model will be sold only for wall mounting. The set, which weighs 365 pounds, will ship with an included wall-mount bracket."
So it seems like Walmart won't be selling the R series initially