While I only see the original iPhone and 3G choices on the support site now, it stands to reason that this photo may have been taken from a screen showing unpublished support content. Click the image for the full-res photo.
This adds to some already interesting news, reported earlier by AppleInsider, that new model placeholders have begun appearing in inventory for Carphone Warehouse, a retailer that resells the iPhone. These models were labeled with a "V3", which could simply mean Version 3, or the V may also stand for "Video" or "Video 3G". Other retailers have also recently reported additional entries or placeholders showing up in their inventories, and many carriers have also received end of life notices for the current 3G models.
So even if a new model isn't announced at WWDC, it's a pretty safe bet that Apple has something in the pipeline.