A V10 model would be great, but as commented, it's probably gonna come out as a V8, perhaps with a V10 option.

I think Honda 4.0ltr V8 power would be more than enough. Just imagine 2 K20A2s strapped together... 300kw anyone? Mwahahhaha!
Actualy it'd be cool if it used a similar head design to the K series, so you could put K series cams in it.