12x .303s may not be as 'powerful' as we might expect. At least, according to Tony Williams. (Tony's site seems to be down, however... and I can't pull any direct quotes from him)
Having 12 wing-mounted guns is a convergence nightmare, not to mention the added weight of guns and ammunition would be effecting the plane performance pretty badly.
After 1940, more and more planes were receiving protective armour in vital spots, and rifle-calibre machine guns just weren't enough. IMO 12x .303s would be about as good as 4x .50s.. except it would need all of the 12 streams of bullets to converged at a single point, instead of four streams to converge as required in 4x .50s.
My guess is, if we get this plane, it'd definately be easier to 'ping' the enemy plane with it, but to actually do damage and shoot the enemy down it won't be much better than the Hurri1. At least, not as much as we'd hope.
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But that's just specs and performance. Personally, I'd like to see that plane too. More planes is always is a good thing.