Walked into EBGames last month and the store display unit had RRoDed. One would assume the MS rep would be supplying the most current unit to provent that from happening, but I can't confirm if that was the case. However the sales clerk carryed on about it like it was a regular occurance, bad mouthing MS and their crappy tech.
Regardless, most 360s are not stored in little plastic cases and running all day long so that's not necessarily a sign that one at home would RRoD, but it is a sign it still happens to this day.