It isn't really written down what you may expect regarding details but 1. usually your hometown will look worse than the rest because you know it too well and 2. TrueEarth tries to capture the feel of the scenery with some POI's here and there and autogen in most places. It doesn't show you what's actually down there APART FROM (obviously) the photoreal textures (although things may not be totally up to date). Even the CityScape area's won't look exactly like the real thing (again apart from the POI's). And you can't expect 10.000 POI's or every city to look real in a scenery costing 34 euro's.
Concerning improvements: it would be nice already if all main churches would be at least represented with a specific autogen building (because every town or village has one and you simply need those to portray the Netherlands). The same goes for all light houses. Other than that you can't expect anything, really, and everything that will be added will be a nice bonus.
I wonder if freeware additions could play a role in this... I can imagine people adding detail to their own hometown and it would be nice if those additions could somehow be shared officially and legally.