I'd be very interested to see what they say about the software update. My understanding of the problem is that a solution is beyond a simple software fix and more mechanical.
The 1.5 TSI uses a miller cycle engine, which basically means the inlet valves are opened on the combustion stroke. Mechanical engineering states that compression would be lost with the inlet valves open on the combustion stroke and the engine will stall. However, in the miller cycle motor they use the turbo to create back pressure during the combustion stroke, this allows up to 15% more combustion and therefore more torque and power with better economy.
The 1.5 TSI's turbo is designed to spool up at very low RPM, around 1000rpm, as we know turbo's work off exhaust gases. So, when you pull away, the revs drop, the turbo stops spooling, the back pressure drops and the car tries to stall, the result - kangarooing.
The Miller cycle engine works perfectly with a DSG as the car is able to control the clutch, gear, throttle position etc. in a manual car, this is not the case.
my 10p's worth.