Man, is this wild speculation; we've no no "rumblings" from Fender about this cab, sorry if I've stirred up anything... but anyway...Sorry, I meant to say "8-ohm" instead of "4-ohm". My idea (expressed without drinking enough coffee yet) is that I could run a 4x12 rig off the Rumble head if they made 8-ohm 2x12 cabs.
I'm not sure they'd go the route of different ohmages. They want to keep costs down, so I'd expect them to use the same speakers, which makes it 4 ohm.
But here is an absolute dealbreaker for me: If they did the offset location in a cab. I want a linear array - stacked in a direct line. I wanted it in the 210 cab and it didn't happen. It makes a difference if you ever want to stack cabs. [Invalid or Expired Link Removed] gets this idea, most US manufacturers don't.

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