Adobe announced Acrobat X Family of Products which includes Adobe Reader X as well as Acrobat X Suite, Acrobat X Pro, and Acrobat X Standard. Reader X.
Acrobat X family include, support for PDF files with greater content types, such as videos, drawings, spreadsheets, email messages and many other multimedia elements, which'll all be interactive. You'll also be able to make and share notes on a PDF, use a 'Protected Mode' within Reader, to help you protect against malicious PDF files, and directly access Acrobat.com services from within the app.
Adobe also touts 'Expanded PDF access via mobile devices with free Adobe Reader for Android, Windows Phone 7 and Blackberry Tablet OS' in its announcement, indicating that Adobe has mobile versions of Reader in the works for the brand new WP7, and RIM's yet to be released, BlackBerry Tablet OS, which'll join the already available Adobe Reader for Android.