I think I would stick with the standard 1.6 diesel rather than the Bluemotion. Whilst the tweaks will no doubt improve economy, I'm not keen on the longer gear ratios.
Also where's the benefit for company car drivers? Providing the standard 1.6 diesel drops below 120g/km (which it almost certainly will) there is little to persuade me to chose a Bluemotion.
Finally, I find myself a little unwhelmed by the economy and emission figures. If a Focus Econetic can manage 65mpg and 115g/km CO2 without longer gear ratios, regenerative braking or a Stop Start system, the Bluemotion doesn't seem to move the game on much, or am I expecting too much? Now thats not to say the Focus is the better car, (despite the fact I drive a standard 1.6 TDCi Focus), but that the Golf isn't as big a step forward as I hoped. Perhaps the 99g/km version will impress me a bit more...