It's looking like the iPad is just the smaller version (dual screen iPod Touch) while the larger single screen version is the iSlate, Apple Reader, iCanvas whatever.
And then there's the MacBook Touch. If it's anything like the mockups, it'll steal the show off the iPad and/or iSlate. Way up there in price point too.
So consider the possibility of THREE new tablet products that we're trying to guess the names of, not just one. The iPad being just the smallest one, a variation of the iPod. The two smaller ones running iPhone OS while the bigger one runs OSX.