Does there exist any Apple hardware "Cloud Computing" solutions?
No - Apple stopped selling both its enterprise storage Xserve RAID as well as its enterprise server Xserve in February 2008 and January 2011 respectively. Even the workstation-class Mac Pro has only seen incremental updates over time so the only way to get "into the cloud" with Apple as of late 2012 is by developing software that uses their iCloud API and service.

The only credible rumor of Apple product is the very vague announcement to the "Pro user community" from a short email by Tim Cook that promised that Apple are "working on something really great" for later in 2013. Whether that is going to be new (and perhaps cloud-based) hardware or software or just a re-design of what we've already seen is left to a lot of rumor and speculation at present.