Being from Austria I think I can chime in and add a little bit to the confusion...
Austria indeed is a very popular test market for 3G UMTS devices. Every major cell provider in Austria has a full-featured UMTS network, the demographics of the country are also pretty 'average' - Phone manufacturers often drop their brand new handsets onto the austrian market to see how people react to the new phones and most important... how they use it (i.e. how many minutes are they talking, how much data usage and how much roaming is going on)
Network providers do the same thing. Phone plans change very frequently over here to adapt to the new market situation, or new handset features. Having 5 full-service UMTS providers for only 8 million austrians is quite a nice little test bed.
Sadly, also the 'bad' features get tested here first. Back in the nineties, we were one of the first markets in europe to get subsidized phones, with sim-locks and 6-12 months contracts (which has now grown up to 24 months)
to summarize: Austria may well be one of the first countries to get the 3G iPhone, but not for technical prototype testing or so, they'll rather test new rate plans specifically for the european market here.