While asm.js was basically just a textual encoding of C in JavaScript... round and round we go! :)

I'd say it more a textual encoding of LLVM IR. Which makes the s-expression text format of WebAssembly a text encoding of a binary encoding of a javascript encoding of a compiler intermediate representation of your program. Round and round indeed.

WebAssembly is a statically-typed language which passes values around using a stack. It’s very different from asm.js.

Yeah, but it doesn't have "Javascript" in the name, which makes it automatically better by way of bypassing everyone's irrational hatred of JS