It looks like they're selling the display models.
Earlier in the week the website showed the gray roll cab and hutch available at my local store (see above image) - and three other stores "nearby" with them. Was in the area this morning, so stopped in. Empty floor along the cabinet lineup. The store was busy, so I didn't ask anyone and just figured they didn't have it unpacked yet - which I thought was odd given the excitement over them.
Came home and checked the website. Only one store with a 72" roll cab - a gray one - "nearby" at 145 miles from me. No other colors "nearby." Four "nearby" stores - from 100 to 145 miles away - show gray hutches available. No other colors. Five "nearby" - 100 to 200 miles away - stores show gray top boxes available. No other colors.
Some of them (roll cab, top box, hutch) and some of the colors say in store order only while others say available online later in May.
For as much as they were saying "available May 1st" and making a big deal about the release of Series 3, it seems kind of strange that they're not even keeping them in the stores for you to look at. I'm not in the market for any of it since I bought my roll cab a year ago, but I'd want to see one in person before I placed my order.