To reply to my own post, and with big thanks to user CameronH, if you go to education.emc.com and search for "theory", the "Theory of VNXe" course is still available and is free (separate from the VNX Foundations course). It provides a decent level of detail on how the VNXe is designed.
Firstly, I know that EMC sell the VNXe as a "simple" device for the non-storage admin, but let's be realistic: There are some of us who want to know the technical details!  For example, are there are resources that explain the CSX foundation and how it's implemented (Linux kernel modules?), what a Shared Folder Server actually is (virtual machine? chroot jailed set of processes? kernel modules?) and how the networking really works (I've seen bonded interfaces in the Linux operating system but nothing that maps to the MAC addresses that my Shared Folder Servers are answering to)?  I've seen a single slide that comes from a VNXe Theory of Operations presentation which I guess is part of the VNX Foundations training course, but I don't personally have any need to get into the VNX side and only want the VNXe details. I can't see my line management wanting to spend out on a course that is pretty much irrelevant in terms of content.  Any EMCers able to help out here???  At the risk of self promotion, I've put together some details that I've managed to work out by looking at the support log data, and by logging in over SSH and having a look around. I've put this on my blog, but I admit there's a fair amount of guess work and I'd be interested in finding out more (I'd also be happy to correct any errors!).  Thanks!  JR
Getting architecture details on the VNXe?