Once the stable release for 1.3.0 is out, we will look to push some updates to the Migration Plugin.
Other thread re this: CP Migration plugin needs some TLC
Here is a running list of work which would be nice to get done:
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Point one is already covered by a PR to the migration plugin here:
Point two is also already covered by a PR to the APIs here:
Point three is beyond my capabilities 
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Re point 3, I think as a very basic start we should add some test coverage to the plugin. Then once we have a test suite running we can wrestle with getting it to automatically run with new updates.
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Both PRs look good to me 
We can probably try get those 2 merged in this week?
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Migration plugin api update has been pushed. This bumps the max version that is supported and adds support for checking for plugins and themes that conflict. Thanks @MattyRob.
This patch updates supported WordPress migrations from:
5.5.4, 5.5.5
5.6, 5.6.1, 5.6.2, 5.6.3, 5.6.4
5.7, 5.7.1, 5.7.2
With reported success migrating from WP 5.8 we will get a PR up for that too, and deployed hopefully by early next week. The more people testing the migration from WP 5.8 the more confidence we have bumping the version in the API.
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