Even though I was going to wait until official beta, the whole Sierra Script thing kind of derailed that a bit. So I decided to release an interim version (details in the first post of this thread, again).
To convert a game from the existing syntax, open the game properties and select "Sierra Script" for the language, then click ok. A bunch of confirm and warning dialogs will come up asking if you want to convert everything now. The UI will hang while it does this (since this would be rarely-used, I didn't offer progress/cancel functionality). Takes a few seconds on my machine, or around 30 seconds in debug builds. So things may appear hung for a while. If you have open script files, you'll need to close and re-open them to see the changes.
(You can also convert on a script-by-script basis by clicking the convert button at the top of the script editor. It's enabled if the current script is in a different language than the default game language).
I don't have a converted template-game in there yet, but you can just create a new one (but make sure to choose SCI Studio as the language when you do that), then convert. Should work with both SCI0 and SCI 1.1 template games.
The template game also has a lot of changes, but I've been keeping the last few posts in this thread up-to-date, particularly this one:
http://sciprogramming.com/community/index.php?topic=1458.msg7971#msg7971If you want to update an existing game you're working on, there will be lots of find-and-replace and file renaming. Or if you don't care, you can just keep your game as is. There were a few small changes to sci.sh which will cause compiles to fail though.