mine is coming in august :D

anyone care to take a punt as to how many kw a supercharged or turbo'd version could get up to (without going to crazy on extras, keeping most of the thing fairly stock)? someone on whirlpool mentioned HKS are making a supercharger kit for it....warranty be damned.

7 PSI SC will definitely make 220 - 230 Kilowatts at the rears so around 300 RWHP.
 
I think Turbo will just be too hard. SC being a better option at this stage.

Youtube footage
http://www.youtube.com/watch?v=lwIilncWpG8
 

it runs 12:5:1 compression.. GL with turbo lol
the ecu has not yet beenc racked so nobody can tune it yet
and no aftermarket ECu support DI yet.. not even a top model haltech.

220-230 kW @ 7psi sounds pretty optimistic considering that would be ~100 rwkW over stock?

Not really, done it with my car. Power is the same as the Beams RED TOP
147 Kw's
I lowered compression from 11:1 to 8.9:1. 7 psi gave 208 RWKW's
So 12.5:1  will easily go over 220 RWKW's 
I know someone who already has one with the engine out and apart :)
 
A low boost application wont need any upgrades.
Only the big boys will have ECU's that can do both direct and port fuel injection. So the probability is only MoTec

http://www.raptorsc.com.au/kits.php?id=63
 

Well the pricing is out now and is surprisingly low  The entry manual model will be $29,990 odd and the auto $32,490. That gets you 147kw and 205nm. There is a GTS version which probably has leather and other goodies for another $5,000 I think.
Looks like the more powerful upmarket engine will be in the Subaru version as someone mentioned earlier but it's a lot of car for the money considering the price of new MX5's.

It's cheaper then I thought it would be. I don't know if I'm blind or what, but it has no visual appeal to me :(! It looks all out of proportion. Maybe once I see it in the flesh out on the road I will change my mind.