Re: Out, damned spot! Out, I say!
Fine, it's not the same code line for line, but the gameplay is identical to MCPE, and it's multiplayer compatible with MCPE, and not the Java version. It's MCPE on a (Windows-only) PC for all intents and purposes.
My point, though, was in reply to your original statement of "no need for Java anymore". That simply isn't true for anyone in the very sizeable modding community that exists today, regardless of whether MS discontinue it or not. Minecraft Win10/MCPE has no modding support at all, and if it ever does get modding support, you can bet that it will be 1) a locked-down and limited API, completely incompatible with Forge, Bukkit, Sponge or any existing API, and 2) probably encourage paid-for mods via an app-store arrangement. In other words, crap. Oh yeah, and no Linux support, because, you know, this is MS we're talking about.
So yeah, there's still very much a need for Java, thanks.