I didn't even know one was coming. I'm still expecting to migrate off of mine onto a Windows Mobile device soon, but since when that happens Yaty will get my Sidekick, it's good to know that they are continuing to improve. Best feature added?
Support for JavaScript on Web pages
[ T-Mobile Sidekick Help ]
Yes, you read that right. Up until now the Sidekick didn't do JavaScript. They've added tons of little short cuts too, and finally support for transferring contacts back and forth from your SIM. Still missing? Ability to use WAV files attached to emails as ringers...