According to the most recent deprecation plans Personal Geodatabases will still be supported for ArcGIS Desktop 10 and 10.1. However, Personal Geodatabases will no longer be supported for ArcGIS Server starting at version 10.1. Even though the support is still there for Desktop I know ESRI recommends that folks migrate over to the File Geodatabase. Below is a PowerPoint presentation from an ESRI conference a couple years back that deals with the benefits of the File Geodatabase.
I think it's safe to say that the Personal Geodatabase will eventually be phased out based on ESRI's emphasis on the File Geodatabase and their past recommendations for migrating over to this format. Hope this helps.
