When they were in DC they said the pilots for retail were happening in Q2 but then expected to learn from them and redesign everything before doing a first generation in late Q4 (I would expect more like Q1).
Home Depot has always included retail pilots, if you go back to Q2 2014 conference call (or the business update around that time) when they first mentioned big box retailer they discussed the benefits to the store and sounded as if it was part of the contract.
I think this made Andy realized they needed to beef up the hydrogen technology side of the business so they are now the complete system integrator and just by basic parts like pips pumps and tanks to put together the solution for the market segment.