I don’t know what HP is about to announce at the event that’s starting now. But I’ll say this: Jon Rubenstein was a high-level exec at Apple back when Apple was in the midst of creating the iPhone. Which means he knew that the plan was originally to make iOS a tablet OS. Which means that it’s very likely that WebOS is going to work better on a tablet than Android ever will.
I’m not saying it’s going to be a successful product or not. I’m saying that the success of an HP tablet running WebOS will be likely much more dependent on marketing and product placement than it will on the quality of the OS. If there’s room for competition for the iPad, HP has as good a chance as Google or anyone else.