We've learned much more about the codenames since then, btw; much of that tweet has actually been found to be inaccurate (more in a sec). The fact that it's nx-abcd actually seems to indicate a new form factor (not hybrid or handheld). You would think TV-only, but that's already taken by nx-abcb, so I'm not sure what this is. The update is still being datamined, however.
Anyway, what we've learned since that tweet: there have been 5 hardware models supported by the OS; these are Icosa, Copper, Hoag, Iowa, and Calcio. Icosa, Hoag, and Iowa have been released; they're the launch model, the lite, and the updated model with improved battery life, respectively.
Copper was removed after the RCM hardware bug was found, but based on its implemented services it seemed to be a non-mobile device (it didn't implement battery or charging services, and had HDMI services unique to it that are theoretically handled by the dock in the hybrid Switch).
Calcio is interesting. It only popped up in one of the 9.X updates, seemingly indicating it's in active development. It appears to essentially be Copper but on the new Mariko chip found in Hoag and Iowa and, curiously, lacks support for game cards, suggesting a digital-only device. If my speculation that a TV-only device would be positioned as a sort of super-economical option (even cheaper than the lite) is accurate, that would make some sense.
These 5 models fall into three form factors: nx-abca2, nx-abcb, and nx-abcc. Icosa and Iowa are nx-abca2, Copper and Calcio are nx-abcb, and Hoag is nx-abcc. You may also notice some consistency in the naming; abca2 devices start with 'I' (integrated?), nx-abcbs start with 'C' (console), and nx-abcc is 'H' (handheld). The previous thought that some of these terms referred to dev kits is inaccurate; the dev kits use the same hardware configs and form factors as the retail units.
Source here:
SPOILER: 1:02:30-1:15:00
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