Damo
Site says it all I reckon - if it had more changes then they would show them. Anyway - the $2700 would cover the wheels, Recaro's & Alcantara - not much more IMO.
You can of course get a digital copy of the brochure from the Mazda site...
Attached is some info I grabbed at the time of the Paris show in 2008 - may have some more 'general' info there...
I certainly think the exterior changes look good - particularly in Sunset Yellow - and I understand the engine mods make then a little more dynamic. If I had a spare $51k (and didn't have a 5 already!) thats what I'd be going for. If you are fixed on Bilsteins you can always add later...
You may also be interested in the following link: (albeit it's not an Aus write-up)
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2009 Mazda MX-5 Miata: First Drive - 2009 Mazda MX-5 Miata - Jalopnik