Regarding ZX Spectrum Next (KS3) dual SD card support:

• There are no exact specs confirmed by any official source describing how dual SD support will work.

That being said, a rough consensus of sorts seems to have formed among enthusiasts about the most plausible model that's to be expected:

• Internal SD likely holds system / OS / firmware stuff

• External SD likely handles games, data, user storage

• Internal SD is probably not removable via standard user access

• Backing up internal without opening is uncertain / possibly non-trivial

Other conjectures about system updates over WiFI and other work modes have been theorised, but seem to be considered less plausible by most.

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