It's nice to hear of continued development in WebOS; the performance of Javascript VMs has only improved since the last efforts, and there are new techniques that a dedicated team could employ to make it even faster (e.g- compile into reusable code optimised for each device, without losing the accessibility of HTML/Javascript development).
I'm also a big fan of WebOS for spawning Enyo, which is a great Javascript toolkit; as an OS it just wasn't really quite ready, but I think that now the tools exist to make it much more powerful than before.