Although it has been a while that HP Slate projects has halted. Now, in a HP page, it shows up a HP Slate 500 running Windows 7 Premium.
I believe it may be a residue page that HP forgot to pull out. Reason is because we already know that there may be a WebOS tablet in October.
Some information on this HP Slate 500.
No matter where you are or what kind of fun you’re in the mood for, the HP Slate 500 is all you need. Exclusive HP software gives you access to photos, videos and everything on the Internet with just a touch, while Windows® 7 Premium gives you the power to do what you want. The unique design and 22.6 cm (8.9″) screen put the full Internet in your hands, while two cameras (video and still) let you capture life as it happens or participate in web conferencing. Adjust the screen orientation to fit your content and use the pen to write or draw as if on a piece of paper. Whatever you want to do, the HP Slate 500 helps you do it – and makes it more fun too.