Their slack is on the free tier, so I couldn't find a direct quote within the last 90 days, but this comes up from time to time. Last I heard it's not on the roadmap but there's interest.
I didn't think of it as paralell builds so much as a big patchwork quilt where some patches are data and others are code and you can kind of wander around and see which data is related to which other data through which functions.
I’m working on a low core project that is already using content addressable source code that is stored in IPFS at https://github.com/yazz/yazz so it can be done
(Assuming I understand the claims properly)