This pre-release allows you to finally upload your own worlds to Realms and adds an option to allow you to enable command-blocks on your own Realm.
Mojang Team just published a pre-release version of Minecraft 1.7.10 that contains updates for Realms. All Realms related modules were moved into a separate library.
How does this release affect you? If you are not playing on Realms, it does not change anything at all. The main advantage is that we don’t have to release new updates for Minecraft 1.7.x in the future, if we want to add new features to Realms.
To get snapshots, open your launcher and press the “New Profile” button. Call it “snapshots” and check the box saying “Enable experimental development snapshots” and save. To switch to the normal version, you can select it in the dropdown at the bottom left corner of the launcher. Back up your world first or run the game on in a different folder (See the “new profile” dialog). Snapshots can corrupt your world, please backup and/or run them in a different folder from your main worlds.
Cross-platform server jar: https://s3.amazonaws.com/Minecraft.Download/versions/1.7.10-pre4/minecraft_server.1.7.10-pre4.jar
Cross-platform server windows exe: https://s3.amazonaws.com/Minecraft.Download/versions/1.7.10-pre4/minecraft_server.1.7.10-pre4.exe
Credits: Mojang Team