I would encourage you to make that a priority. Every time I see something about SproutCore, I'm interested but end up not doing anything with it. I keep hearing about the demos being out of date.
Things like this: "we have a great new default theme called Ace 2.0"
Sounds great, how about a screenshot or two, if not a demo?
And this: "looks at home on ... mobile operating systems"
More info please? I'm interested but I see no examples, screenshots or other info about doing mobile dev. Device, browser and OS support?