ZOMG! We're 3 weeks before WWDC here people! Everything is iPhone!
Okay, in all fairness, Best Buy is one of the very few big iPhone retailers (aside from Apple, AT&T, and Walmart) and even if they have no direct info from Apple, they could be prepping themselves for a similar launch as last year (iPhone 3G in 8GB, 16GB Black, and 16GB white).
UPDATE: Our friend Phil over at WMExperts, throws in a plot twist: what if they're new Windows Phones?!