Quoting Google's Russel Cox in a mailing list discussion linked to above: "Go requires that int be at least 32 bits and that int64 and uint64 be supplied; practically that means we've given up on 8- and 16-bit CPUs."
Yeah, I was just thinking that C# sounds a lot like his ideal language. It kind of feels like he's one of those people who thinks that C# == java. It doesn't hit all his points, but it hits a few.