They’re making little robotic Renfields.
This “self-replicating” thing. You mean, like, assembling a bunch of spare parts, yes? Otherwise, we’re headed into some really creepy territory here…
“Cf33310! Check out the gymbals on this coldie! 0011100101, but I’d love to plug and play with those USB ports!..”
It’s a shame that the plane carrying the Wachowski Brothers went down in bad weather – along with the scripts, drafts, and legal documents about the rights to the film – shortly before the third Matrix movie could ever be made. I’ll always wonder whether it could have lived up to the promises made by the second film.
…for a grand total of three programming languages. 
Seriously, though: meat-eating robots? Revoke their creative license stat.