This is the crux of what's going on in the UK right now:
Everyone is up in arms about these potential changes to the WA but the headlines belie what's actually going on.
It all revolves around the Internal Market paper that has been out for months and forms part of the...
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...backbone of what the UK will do internally after Brexit. Of course, it has to cover all possibilities deal/no-deal, so of course it may seem to go against the WA in some areas, as it stands now.

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The issue is that folks are using a possible "worst case" scenario for the future against things as they are now.
That's wrong and if Johnson confirms as much, that's going to take a lot of the sting out of this $GBP sell off.