https://youtu.be/dOJLmVnFmhc?t=90 (1:30 time mark)

The only reason I can see why we can play WoC in TWW3 is if WoC have a place on either the TWW3 campaign map or the combined one. Unless there is a LL specific to WoC that CA is hiding and thus included only on the TWW3 map, this hints the combined map will be playable IMO.
I suppose the only time a faction was playable in custom but not campaign was Bretonnia, right?
One caveat I can think of off the top of my head: CA may have just mistakenly shown this roster even though they're not at all playable on release.
Edit:

Well, I think this about answers my question.
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0 · Disagree Agree- Anonymous
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12 · Disagree 12Agree- Anonymous
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3 · 1Disagree 3AgreeASUS TUF 3080 12 GB
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0 · Disagree AgreeSigvald isn't getting moved.
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5 · 4Disagree 5Agree- Anonymous
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3 · 1Disagree 3Agree- Report
3 · 2Disagree 3AgreeSo I think you are jumping to conclusions.
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0 · Disagree AgreeI wasn't aware of the above, it appears I probably am.
I'd like for that to be proven wrong of course, and CA may have upped the release day. Until I know that though I'm going to assume it'll take longer than even Mortal Empires did to come (a month)
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0 · Disagree AgreeThis is just the ME build.
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0 · Disagree AgreeWell, I think this about answers my question.
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0 · Disagree Agree- Report
2 · Disagree 2AgreeASUS TUF 3080 12 GB
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1 · Disagree 1Agree