Hmm, I remembered seeing this a while back so I had to search for it.
http://www.anandtech.com/show/7742/im-intelligent-memory-to-release-16gb-unregistered-ddr3-modules
This is when they were announced and they do have the part numbers available on their site right now:
http://www.intelligentmemory.com/dram-modules/ddr3-so-dimm/
However I don't see any US distributors on their site??
And after skimming that Anandtech article again theres mention of the 16 GB modules not being compatible with Intel processors. Which makes me wonder, then, how Intel puts on their spec sheet a 32 GB max with 2 channel memory when the processors don't support the 16 GB modules?
I think they will support 4 8gb sticks as in the IMac and rMBP.