The folks over at the O Street Market blog, believe in the November 2013 opening. There's picture of a nice big underground garage, so big you can drive a truck through it. And I swung by today and snapped a photo of what looks like the freezer/beverage / whatever section. Bisnow has another photo of the store interior.
If you live in the hood, you have seen the progress of this Giant project and there is still a lot of work that needs to be done. Will the grocery store be ready to open in November? Maybe late November.