[taliesinb]

AFAIK, Mathematica 10 won't have cloud integration. And the semantic stuff will be present, but will be "trial grade".

The emphasis in Discovery and Data Science platforms will be around workflow and reporting, though the features there haven't been finalized yet.

[taliesinb]

I've been told I'm wrong, Mathematica 10 will have cloud integration, but with a product called Mathematica Online (see wolframcloud.com for the whole family of cloud products).