There are a whole host of new engines which will be added during the B8's production cycle.

The most important (sales wise) will be the 2.0T which is rumoured to have 210-215 bhp and slightly better fuel economy than the outgoing 2.0T unit.

A monstrous 3.7 V6 TDI with around 300 bhp is going in the next generation A6, and Audi are considering using it in the B8 A4 too.

A 3.2 V6 with two turbos mounted in parrallel is almost certain to be unveiled next year. This is in direct competition with the BMW 335i, and will have 305bhp as opposed to the 265 bhp in the N/A 3.2 engine. The 3.2T will be cosmetically different to the rest of the A4's and will have bigger arches and a more aggressive bumper design. It will also have unique alloys.

The S4 is rumoured to keep the same 4.2 V8 engine but power will be upped to 365 bhp, whilst offering lower CO2 output and better fuel economy than the existing unit.

The RS4's engine will be slightly larger displacement at 4.4 but will essentially be the same high revving engine currently found in the B7, power will be around 430 bhp. Audi are also considering making a stripped out version which weighs 80kg less and has a little more power. The DSG transmission is almost certainly going to be used and the 0-60 time will be reduced to just over 4 seconds.