Sproul Jr's position seems identical to the Lutheran one from what I understand of it:

My understanding of the Lutheran position is that baptized children reach an unspecific age or level of maturity where they lose their "covenant child status" and thereafter "maintain" their salvation by continuing in the church and receiving regular absolution there. That sounds identical to Sproul Jr's position.

It seems to me also that some have been willing to go to almost any lengths to legitimize paedocommunion in their Reformed denominations - even if it means turning the Reformation on its head.

Neither Sproul Jr's nor the Lutheran church's position is anything like Luther's was! Luther, going back to Augustine as well as Paul, hammered home justification by faith alone. I think he would be royally ticked off to see what has become of the church that calls itself by his name.

A very enlightening article on this "new perspective" can be found here which sheds a lot of light on the deeper theology that drives many paedocommunion advocates.

-Robin