Just got back from the boulevard tour and ran into Steven Pauwels in the tasting room. I asked him about the difference between the Saison-Brett and Tank 7. Specifically, I asked why their website said they used Magnum, Bravo, and Amarillo in the Tank 7, but only Magnum and Amarillo in the Saison-Brett. After a glance of intrigue, he told me that they don't use Bravo in either and that their website was incorrect. He said the only real difference is that they do not dry hop with Amarillo in the Saison-Brett. He mentioned the Brett helps to dry out the Saison-Brett, so it has a lower FG. Also, they use Orval's culture for their Brett.
I also asked one of the tour guides about their House Belgian yeast, particularly if it was more of a saison yeast or an abbey/trappist yeast. He said he couldn't tell me for sure, but that they often pull Bubbblegum, banana, clove, and spice from their yeast. Which sounded to me that the abbey/trappist yeasts would be a better option for cloning either of them.
PS- they have a Saison on tap in their tasting room only as an experimental, and it is phenomenal. Can't wait until that comes in bottles.