According to this post today, Nvidia has announced that their Shield gaming device will be delayed for one month.
Official Post
We’re grateful for all the enthusiasm that’s been expressed for SHIELD, our new portable gaming device. And we’re eager to get it into your hands. But we won’t do that until it’s fully up to the exacting standards that NVIDIA’s known for. And some final quality-assurance testing has just turned up a mechanical issue that we’re not happy with. So, while we announced last week that SHIELD will go on sale this Thursday, we’ve taken the hard decision to delay shipping until next month. The issue relates to a third-party mechanical component, and we’re working around the clock with the supplier to get it up to our expectations. We apologize to those who have preordered SHIELDs and to all those who are waiting for them to go on sale. But we want every SHIELD to be just right. We’ll let you know when we have an exact shipping date in July. We think it will be worth the wait.
