Apple has unleashed the iCloud.com website but it is still limited to developers only. Furthermore they also revealed the pricing for extra storage, if your allotted amount of 5GB just doesn't suit you.
|iCloud Storage Pricing|
If you're an Apple developer, point your browser to iCloud.com for the developer preview as Apple has publicly launched the icloud.com website. An update to iCloud information page, has also shown what the annual costs are for users wanting additional storage. For $20 you can purchase an extra 10GB, $40 for 20GB and $100 gets you 50GB.
More updates as they come.