Besides the Wi-Fi connection repair, the .604 upgrade is also supposed to improve the status bar for recharging the battery, camera and camcorder functions will have smoother transitions, Weather widget icons will be re-designed, you will notice faster Exchange ActiveSync email loading, newly downloaded apps will be organized better, favorite contacts will be organized by number of calls, and there will be faster Visual VoiceMail loading among other things. For a complete list of changes to expect, check out the source link. Sure it stinks to buy a phone that comes out of the box with a number of bugs, no matter how minor they are. But when the carrier and manufacturer are on top of the ball and offer a brisk fix, it is a sign that you as a customer, are considered important to the companies involved.
Motorola DROID X Specifications | Review
source: Verizon via AndroidCentral