Today I sat, and more importantly, passed the CompTIA Cloud+ exam. It was 100 questions and you are allowed 90 minutes to answer them in. All were multiple choice in nature.
My preparation for the exam was to read 
http://www.amazon.co.uk/CompTIA-Cloud-Certification-Study-CV0-001/dp/0071828869/  and make an attempt at both sample exams (one on the disk, one downloaded from the site). After one read through the book I scored a high 90% in each. It's worth noting that the book comes with a 10% discount code so I consider that it paid for itself. The book flows well and is an easy read. 80% of the questions I encountered on the exam were covered in the book and the others were more general IT principles.
Quite oddly, considering the certs name, both the exam and book were surprisingly light on cloud specific material. Other than the ability to
distinguish between the *aaS types and a decent selection of virtualization and hypervisor questions it felt like they'd taken a couple of chapters from network+, security+ and server+ and used them as filler. You don't need to have done any hands on cloud experimentation to earn this exam and it's much of a principles and concepts test than I was expecting.
Considering the very basic level of cloud knowledge this exam tests on I'm actually quite curious as to what's on the 'essentials' exam. If you're looking for something to prove you have 'cloud skills' I think you'd be better off with the Amazon certs. Although they are vendor specific they seem to delve a lot deeper than this exam did.