I tried finding a summary but this was all I got off of the US fansite:
"CRESCENDO is due out in Fall of 2010.
Watch for a summary / synopsis coming soon."
And believe me, I WILL be watching. I'm willing to bed that this book will be amazing, without even knowing what it's about.
Now, I did check out Crescendo's Goodread's page, and on that site it said that it was released on September 30th of THIS YEAR! Ahhh.
Also, no cover yet. But as soon as I see one, I'll get it posted for everyone! Same with the summary. :)