The present status of the project, as given by NRS, is as follows:
NRS are assessing how much work is needed to index these records to allow them to be readily searched so no timescale for the release of these records is known at this stage.
There is no indication as to how these records will be made available, nor on the scope of the project. Certainly ScotlandsPeople has no plans on this, as the priority there just now is the Valuation Rolls which should be going online soon. So at the moment it is anybody's guess as to where and when they will appear - but very interesting to note that FamilySearch is involved!