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All indications are that it will stay much the same as now (and as with TfL). Each individual part of the operation is its own legal entity, but there are some overarching benefits (e.g. even though Overground/TfL Rail staff don't legally work for TfL, they still get a free TfL pass).
It would be a big benefit to staff levels to the local operators, it would be possible to go back to a promotion system to transfer to the "better" jobs. removing some the training costs from the likes of northern.