The G55 is one of my fav WW2 fighters. Three internally mounted MG151's and 2 13mm's, it'd have 190A8 like firepower, with 400 mph top speed at the right altitude, and be able to out turn/climb/fight our fw190A8 every which way until sunday. I haven't found much information on the roll rate, but even if it's average it will still be a very dangerous Axis ride, and likely turn into a very popular one in the MA. I don't think the rear view would be anything to jump and down over.
I'm not holding my breath of ever seeing it in the game in my lifetime, what with the 410 contest being over half a year ago and still not one picture of its existence, but it's fun to hope.