The Machines invade Zion and pull the plug on The Matrix come July 31st, 2009. So, if you've not been back in awhile, it might be a good idea to check out the game one last time before it shuts down. All users have been raised to level 50 and are given 4,000,000,000 $info to mess around with.
The Matrix will be shutting down in similar fashion to the end of beta event, with a truly awesome world ending event. If you weren't there the first time, I highly recommend you experience it now, as I found it to be one of the most awesome, if not the best, end of beta events I've experienced.
Remember, anyone with a former subscription has been reactivated free of charge. Unfortunately, no new accounts are being accepted at this time.
For an example of what happened at the end of beta, check out this amusing clip.