It seems Dewalt is far behind some of the others, namely Makita and Milwaukee, in this technology. 

Our trailer is mostly full of Dewalt 20v and flexvolt tools, but we do have a few Makita and Milwaukee cordless tools for those things Dewalt does not make, or does not make well. I would much rather buy a Dewalt oil impact as we have dozens of batteries, but can not find any info on whether it is in the works or not.