Not sure about Mini Satnav but we have a 2013 BMW X3 and that's pretty good.
The updates are usually annually released and installed by the dealer, probably an extra cost option, but we've not had to get an update yet as we've only had it a month.
As far as I know, BMW don't provide speed camera data on their Nav systems but it can be added with 3rd party software (beware of warranty issues though)
Real time traffic and rerouting are part of the Professional Nav system, haven't really explored them too much as yet though.
Of course all this may be of no use to you as the Mini Nav may be completely different from other BMWs!
Thanks for the reply. It's going to be a while before I can buy my next MINI as the convertible is always launched quite a bit after the hatch, so I guess I've got lots of time to wander in and interrogate a sales person
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