TechPowerUp received a tip that Antec is giving away free USB 3.0 to USB 2.0 front-panel header adapters to customers of P280 and Eleven Hundred cases with motherboards that lack USB 3.0 front-panel headers:
Some of Antec's competitors have bundled USB 3.0 to USB 2.0 front-panel adapters that allow you to connect USB 3.0 front-panel ports to USB 2.0 headers, so at least they could function in 2.0/1.1 modes. This caused Antec's customers to request similar adapters from Antec. The company more than obliged, and in fact is giving those adapters away to existing customers of P280 and Eleven Hundred for free. All existing customers have to do is write to email@example.com with their shipping address and a proof of ownership of P280/Eleven Hundred. It's likely that Antec will begin bundling the adapter with all the P280 and Eleven Hundred cases it will ship hereon.