Hi,
Currently, we have only stated that we want to start removing the old authentication method in Q3/4.
There is no set date at the moment, as soon as we have a date or more information we will post the information on the forum.
In regards to the notificaition period, the post mentioning the new method and our wish to move away from the current solution was posted the 7th of December.
As per our policy regarding breaking changes we strive to inform all ISV's via the forum at least three months prior to the change.
Generally this period is longer, you can read more about this here: Notifications regarding breaking changes in the Production environment
The NextGen SalesOrder API was in a different position when it was announced and still is.
It was made available early with only a few endpoints to allow for the community to be involved in shaping the functionality of the new service.
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