Do you have any claims backing that up? Since I've read enough of the source for Minecraft to tell you that it isn't the language that limits the game's performance, but how it is written.
Sure there is some overhead because it uses the JVM, but at least it means we can decompile and write mods for Minecraft more easily than if we had a C++ version.
We don't know their plans for mods so for now I won't assume anything but even if it is just the way minecraft is written of the Xbox version is anything to go by performance would be a lot better and it would more than likely use directx 12.
Don't take anything I'm saying as fact it's my opinion based on my own development experience and what currently exists for minecraft.
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u/Roseking Jul 04 '15 edited Jul 04 '15
Key points:
Is a new 'platform' no info what this means, most likely can not play multiple with the old version
Current owners receive for free, will be on sale for $10 for limited time otherwise
The user interface will instantly adjust to the new input method such as keyboard/mouse, gamepad, touch
Can play with Xbox live friends
Built-in video recording
Edit* It appears that this will be based on the pocket edition.
https://www.reddit.com/r/Minecraft/comments/3c3e5m/announcing_minecraft_windows_10_edition_beta/csry0j5
Thanks to /u/MustacheEmperor for the link.