I don't know if anything has already been decided, but I would like to express my concern regarding the possible legal problems that may arise from the use of "renku" (while being a fantastic word for our project)
Legal problems mean lawyers' fees, compensation costs for damages to the other party, possible damage to our image and the nullification of the "marketing" invested up to that point.
Personally I like OS/B, it reminds me the era of OS/2, which was the evolution of DOS. OS/B as pointed out is the reciprocal of B/OS (read as Be/OS).
And as OS/2 is not the second choice, but the sequel.