Rick Jelliffe is the one who in his blog talk about that he proposed to split dis29500 into 9 parts.
If this was an informal suggestion, a proposal that Microsoft accepted and is preparing behind the scenes if the BRM fail to solve enough problems with dis29500 or a proposal the Microsoft rejected because splitting dis29500 not really solve anything is not possible for us to know.
Looking at the track record of Rick Jelliffe it seems like most of his posts seem very "political". I have yet never seen him make a post that does not include spin to aid the OOXML standardization. Maybe the reason for the "9 parts suggestion" is quite simple…to divert the attention of the bloggers that follow Microsoft attempt to trick the world to accept OOXML.
My thought would be that until a authoriative source that is independent of Microsoft talk about the 9 parts proposal we are better of to focus on more important things.