It would appear some pictures of HP's upcoming Slate 8 have been leaked by...HP itself. On HP's website, there is a promotion which has the tablet in it. This should mean that the release date is not to far in the future. Previously, the upcoming tablet had popped up in an advert and now the back has popped up in this latest promotion.
This tablet that is featured in the promotion is likely to the Slate 8, as long as it isn't some fake tablet built for the promotion. The Slate 8 is set to be an x86-powered tablet with a 10.1-inch screen according to earlier leaks. The picture shows a silver device with an HP logo on the back and what appears to be a headphone jack along the top.
The tablet is in the hands of a doctor, well, at least an actress dressed like a doctor, so it's likely going to be marketed at businesses and professionals rather than your average consumer. This is backed up by another leak that says it will run Windows 8 Professional instead of RT. The tablet should launch sometime this year, likely shortly after Windows 8 launches.