Great! Can't wait.
Hopefully independent developers can do what HP could not in terms of bug fixing and other functionality like that.
Eventually, I'd love to see a port to other devices; since multitasking is handled far better than Apple or Android devices can muster with the cards and the stock apps are also better (one e-mail account for Android? Give me a break!)- WebOS is the only tablet OS I know of (with the possible exception of Windows 8) that can actually run two applications at once.
For example, I can listen to something on a web page (i.e. a YouTube video) and check e-mail at the same time.
The thing that I'd really like to see is more virtualization, though. A stock Linux environment can already be produced on this tablet via chroot; I don't see the reason (now that the firmware is open-source it should be a simple matter to remove the security restrictions and allow other things to run in a card, like, say, Android 4.0).
If only we had more lower-cost webOS tablets that actually worked; though I assume that will come in time since tablet applications aren't all that sophisticated. Selling them at netbook prices keeping in mind their limitations... bundled with a keyboard and Linux environment instantly makes them a REAL computer for REAL work (unlike machines that fake it like the Acer Iconia A500, ASUS Transformer, and Lenovo ThinkPad tablet, among others).
WebOS's design is just better but it's so kneecapped in its current form.
Just like desktop Linux is: let's hope that we don't get the fragmentation so characteristic of that design.