According to a memo from ATT the white iphones will not be available till late summer.
https://forums.macrumors.com/threads/936384/
Apple normally doesn't display items that you cannot order from online or at their stores.
Your source please. There is no way you can possibly know this unless you are steve jobs.
Why are they displayed all over the Apple Store and at the WWDC then?
Why would they display something they say is not available?