Perhaps it would help to note that Baptists weren't really reformers. They would be "formers," perhaps. They saw no value in trying to change what existed, but rather sought to build according to what they saw in God's Word. This would help to understand why the theology of Reformed Presbys is different from the theology of Reformed Baptists.
As for progressive disp., MacArthur may fit most of the trappings, but he doesn't label himself as such. He doesn't even label himself as dispy because there is so much confusion as to what that actually means these days. Progressives see a future for ethnic Israel. The sign of the NC would be the circumcision of the heart, which is only observable in one's obedience to Christ.
Romans 4 - I might get this wrong - I think Prog Dispys would claim that Abraham's physical circumcision was clearly a result of his salvation (heart circumcision) and a sign of his covenant with God. In obedience to God Israel took the sign of the covenant that was temporal, but had spiritual ramifications. In this there is a two fold Abrahamic Covenant, spiritual/temporal. The NC, on the other hand, is a spiritual covenant with temporal ramifications.
Feel free to correct me if I got the PD perspective a bit tweaked. I haven't looked at it closely for a while.

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For the Glory of our King,
Joe Johnson
Slave of Christ, husband, father, Preacherboy at Cornerstone Community Church, Escanaba, MI. and TMS graduate. Personal website - SoundLife.org

I do not know, and I do not say, that a person cannot believe in Revelation and in evolution, too, for a man may believe that which is infinitely wise and also that which is only asinine. ~ CHS