SP1 has been released! The release includes Management Studio Express, Express Edition with Advanced Services (Full-text Search and Reporting Services) and Express Edition Toolkit (necessary for building reports for Express Edition with Advanced Services).
You can search http://download.microsoft.com or use the links below.
(Note: this is the full download of Express @ the SP1 level. If you want to patch Express, download just SP1)
Express Edition with Advanced Services