Yes it's hard to be clear with only a few words, an analogy.
First off, I'm suggesting there is only one Zen Streamer. LIke the picture above, you can start with a basic Zen Garden, adding features should not change the name. I suggest they drop the NG! I mean look at the fossil record of names used in the past, no need to continue that trend moving forward with the Zen.
Innuos already offers plenty of new features to add to your Zen Garden, if they want to call their maxed out version the Zenith, so be it. However with the new modular approach every feature on the Zenith should be available to the Zen owners. Perhaps Innous already offers this service on a custom build basis and I'm talking semantics.
However let's not forgot our hobbyist roots, adding these features is childs play for many of us, no need to send the Steamer back to Portugal. Who is to say "My Zenith" reflex's the current Innuos version. I may not like the sound of new upgrade power supply, or even the i7 processor version, but I do like what the pSLC drive brings to my Zen garden. I'm not suggesting adding unsanctioned parts, just the freedom to experiment, who knows what we may discover along this journey. Very Zen!
I have already discovered how sensitive my basic Zen Streamer is, adding storage drives took days to stabilize and changed the overall sound, luckily I like what I hear now. Next I want to add an internal Phoenix USB board and compare to my external Phoenix USB. I plugged a USB cable into the internal USB port which is used for both the Phoenix & I2S boards. Guess what, this unused board port requires breakin', sounded poor for days. Further I unplugged my current SPDIF board from the montherboard. (Located right next to the Internal USB port). Quess what, sound improved to my ears, no doubt less resources being used.