So, I purchased the new iStick Mini and it seems I was incorrect in assuming that it is simply the old 10w mini with a higher voltage output and wattage cutoff. Unlike the older mini, it supports variable wattage and variable voltage control along with resistance reading on screen. In fact, this device is more like the original istick than the 10 watt mini. Like the original istick, it will output resistance readings on screen... handy. It similarly supports variable voltage output from 3.0 to 5.5 volts in 0.1 volt increments, with a 20 watt cutoff. Unlike the older mini (and also identical to the original istick), it supports variable wattage output from 8.0 to 20.0 watts in 0.5 watt increments. So far as I can tell, it uses the same chip as the original istick. You even click the fire button 3 times to select between voltage and wattage control... just like the original istick. It simply displays everything on the top of the unit on the same screen the older mini and the iJust D16 use, not on the side like the original and the newer 30 and 50 watt options. Truth be told, I like this screen better... I just wish the device had a stealth mode. This is literally an istick 20 with a different screen, smaller battery, and a smaller chassis. It's the working guts of the original istick crammed into the original 10 watt mini's chassis. And that's nice.
I think that eleaf is going to eventually drop the original 20 watt and the 10 watt mini once back stock of these units has been depleted, replacing both with this device. That would make sense, anyhow. I believe this was the original plan, but the chipset chosen in the original mini didn't allow it.
Really, this device offers everything the original istick did (except for the battery life) in a package less than 2/3 the height. Not too shabby for a stealth mod when paired with the GS Air MS (less than 100mm tall together, incidentally). Either the Nautilus Mini or the Subtank Nano with the newer 1.5 ohm vertical coils rock on this mod at 20 watts... both of the tanks with their drip tips ARE about 10mm taller than the battery itself, though and measure about 115mm in height, total.