Robust early demand for Apple’s iPad has pushed backed the shipping date for the product in the US. Reuters notes that Apple began taking preorders for the iPad on March 12, promising to ship the touchscreen device to buyers on the official sales launch date of April 3, when the iPad will hit US retail store shelves. But the company may have sold out its initial inventory, as Apple’s website now promises a shipping date of April 12 for customers ordering the iPad. Customers who placed their orders earlier this month will still get their devices by April 3, an Apple spokesman told the news agency.