If you don't know yet, I'll tell, the Mountain View company is going to announce - another announcement are Google Nexus S and Android 2.3 Gingerbread - Chrome OS and Chrome Web Store. Thus this month is a big month for Google, no doubts about it.
It is said there will be Youtube video to demo the OS and the Web Store, but the video is not available yet. Just head to Google Chrome Youtube channel, there is nothing about them just yet. Thus just wait.