Begun....the BTU wars have - Bluestar's 25K range
Bluestar just came out with their Platinum Series, which boasts a 25K BTU burner, as well as really cool other features, like an oven that preheats faster, as well as an interchangeable grill/griddle feature.
check it out: http://www.bluestarcooking.com/products/platinum
seems that the only difference with the burner head is that they've added 8 holes along the interior of the innermost circle, whereas in older models (RNB and prior), that part of the burner head was just solid cast iron.
i haven't seen it in person or anything, but it certainly looks great.