The next generation Audi A8 isn't expected until 2010, but our spies have already snapped the new car undergoing heat tests in the US.
The new car will apparently ride on an extended version of the modular platform currently used by the A4. However, it will again make use of Audi's Space Frame technology that uses an aluminium body to keep the weight down and improve dynamics.
New A8's engine line-up will likely mirror the existing one, although a wider range of supercharged units are expected, along with the new 6.0-litre V12 TDI. The 6.0-litre W12 is reportedly being phased out due to its high costs and emissions.
Audi's signature quattro all-wheel drive system will again feature prominently.
The current flagship Audi has been around since 2003 with only minor adjustments being effected since then to keep it current alongside the newer Mercedes S-Class, Lexus LS and BMW 7 Series.