We got confirmation from Boris Schneider-Johne (Senior Product Manager Xbox Platform and Accessories, Microsoft Germany) that a huge Dashboard Update will arrive at the end of May!
Features include background downloading and having multiple downloads at once.
The user marks a file to download and it will be put in an active queue downloadlist. There are 6 slots reserved in that queue. They will be downloaded sequentially not in parallel! If the Xbox360 sees there is bandwith available it will boost the download speed up. During online sessions the downloads will be paused to garantee no lags. It's also possible to turn off the console, after powering it back on the downloads will resume. When a download finishes the user will get a message that it has been downloaded.
He also mentions that there will be a lot more features in there but it will be a surprise and he won't talk about it!
I can't wait for this, downloading is such a pain, downloading in the background should have been implemented from the start. I wonder what the other big surpise is?