Well it has happened already, I've been sent a model created with 2014 that will not open with 8 -

While I find the BIM capability intriguing, I'm not sure I am ready to upgrade and commit to an eight hour trial until I know more about the features and advantages of the new version.

Do we know if their viewer will open this 2014 skp?

"We build too many walls and not enough bridges" - Isaac Newton

http://bridgewright.wordpress.com/