This screenshot from Best Buy's inventory system was submitted to us. It shows an unreleased Apple product in the category of "Mobile Computing" within Best Buy's inventory system. The 'In Stock' date for the item is May 31st.
Best Buy inventory screens always seem to generate a lot of interest, but we've been told in the past that these entries are made without official knowledge from Apple. As a result, there is likely no particular significance to the findings.