In all honesty. Redpower should have gotten the first spotlight, not BuildCraft (not even IndustrialCraft).
I agree, i enjoyed buildcraft on its prime, and i do love me sum hayoish ic2, but quite honestly redpower its the most powerful and interesting tech mod out there so far. Of course being a powerful tool has its drawbacks, only people who have a pretty creative mind can actually enjoy rp2 to their fullest.
I've talked to Sach through IRC once. From what I saw from the mod spotlights, if it was CC then BC then we're definitely next, however we are not active in MCF anymore, so the chance is very low.