No, you can check for the update on your X as well. Hit the menu button, go to settings, scroll down to "About Phone" (which is actually where a lot of useful info is) and there is a "System Updates" tab right at the top. Hit it to see if there's an update waiting for you.
Just like on a BlackBerry (coming from a Storm myself) it won't let you get it early if the carrier isn't ready to push out the update, but once the update starts to go out it may let you get it earlier than the notification would alert you to (carriers purposely stagger the notification for reasons of bandwidth and QC checks).
Edit: And no, I can't get it either yet.