I went and looked at the new GTD at the weekend and it looks ok, but certainly didn't excite me at any level.
Next car will be something different, probably the M135i pending the outcome of my test drive this weekend.. 
There is a certain blandness to the external design of the Golfs which does give them a timeless appeal. It could have been a step change, but like all manufacturers, they tinker a bit here and there with the design without a radical change. It's too much of a risk if they produced such a car as there is a risk they might lose sales. The worst offender is Audi, especially with the A3.
You'll love the M135i. There is an LCI version (facelift) coming out next year around July when the front end will be re-designed and look more like the new 2 Series. BTW Birds Garage can also do an ECU update and wring 370 bhp from the engine and add a Quaife LSD for £3069 inc VAT. There has been a mini review of this in last weeks Auto Car Mag.