What I personally see happening is something like you just stated.Maybe I should re-word what I said, Do you think this maintenance is a precursor to a future update? (I think to myself, if GT6 is going to have the Course Maker tracks for online use or the FIA Championship, the servers have to be able to hold up, and the way they are right now, I doubt it'd be able to hold up with all the new data) However, I'm not very savvy when it comes to this stuff so my hypothesis could be totally far fetched and wrong.
I see nothing happening besides some major work being done to the servers to improve the stability. Maybe a few weeks to a month later, we will see the FIA Championship/Course Maker/Spec 2.0, but I highly doubt we will see anything in the way of an update being released during that period.