Hello Ladies and Gentlemen,
I've came across this german Article:
in which is mentioned that Canonical will increase the Minimum RAM Requirement from 4 to 6 Gig's. This might be for older Machines or more Low Level RAM System a bit difficult - especailly when a built-in Graphics is included.
It could be interesting to see how this will affect the next Main Zorin Release and if the Dev's maybe increase their Requirements, too. The current one's are in my Opinion already too low but with this here it could be neccessary to seriously think about that for the Future.