Over the weekend, it seems Apple was feeling a little generous - they extended their additional storage offer until September 30, 2013. Originally, this offer was made to customers making the transition from MobileMe to iCloud.
At the time, they'd offer the normal 5GB that comes with iCloud to ease this move, and it was set to expire on September 30, 2012. But, Apple have been sending out e-mails to their customers informing them that this would be extended until September 30, 2013.
Nothing is required to take advantage of this, so if you were still wondering whether you should make the move or not, you now have another twelve months to scratch that noggin' of yours. Thanks Lee for sending this in!