There are a number of changes coming in the GDSN Major Release 3, but it will not be deployed until Q2 2016 -- Aligntrac is tracking the release closely along with 1WorldSync (we have been involved in meetings with them on this) and our Sync/PDI solution will be compliant with the release.

We will be notifying our customers of any impacts as soon as the data sync community has clear definitions (i.e. detailed specifications) of all changes involved -- some things have even changed as recently as January, 2015

If a free webinar/overview is available it is probably worth your time to at least see what the major release entails -- you can find out more through the 1WorldSync landing page for the release here:

1WorldSync Major Release

Aligntrac has been following all of this to ensure that Sync/PDI users will have no impact (or at most, a minimum impact) as these changes are implemented in GDSN.