Hi newcomer and welcome to the Tom's hardware forum.
We can't say any yet. Why?, because the Thuban isn't comes out yet, and ASUS can't test the processor with the mobo until that comes out to the market.
welcome to the techworld my friend, let me show you around, there are these wonderfull privilidges manufacturers have where they can send out samples of a product before they decide to release it, because its not like they work on a product straight up to release, the first version of thuban im sure was produced over a year ago,
but they had to refine the process and get it ready for mass production, and its not like they were throwing away all the chips theyve been stockpiling for mass production, other wise, stephen colbert wudnt have gotten an ipad a month before it was released, and michael dell wudnt have been able to show off the dell phone before it even hit massproduction.
According to that tom's news article ASUS said they would be releasing a bios update for the M4 series of boards to support thuban which makes sense as they are its latest set of boards. The M4A79XT is one of their more recent boards so it will likely get its update soon.