The copying comments come from the fact that smart phones looked one way before the iPhone, and then look like the iPhone now. And tablets spent a decade using styluses, and then the iPad came out and now suddenly every tablet is a touch screen. So while you can quibble over this feature here and that feature there (and copying does go back and forth on all sides with features), it's the big picture that demonstrates that the market lets Apple set the overall tone of a product, after which they copy it and try to take market share from Apple.
Will the HP tablets succeed? Probably. HP is big in the business world, and they can probably parlay their contacts (and contracts) into pushing a ton of these toward hapless office workers. As for the consumer market, we'll have to see if HP can come up with a good music store, movie store, app store and cloud solution. If so, they will indeed get a lot of the PC folks to buy their tablet.
But man, couldn't they undercut Apple's pricing even a little?