GSTR-1 and GSTR-3B built from the documents that already posted, exported as the JSON the portal accepts, with the adjustments you are allowed to make kept as a separate, visible layer.
Not a form to re-type into. If the return disagrees with the ledger, the ledger is what you fix — and the return follows.
The rules are data, so a rate change is an edit rather than a release.
Kept against the code rather than a roadmap, because finding out during a demo is worse than reading it here.
Every figure in the return traces back to a document you can open.