Hey, Meteor 1.11-rc.0 is out! If you can please update your project and provide feedback.
The changelog is updated here https://github.com/meteor/meteor/blob/release-1.11/History.md#v111-----tbd
meteor update --release 1.11-rc.0
or create a new Meteor project with it
meteor create my-new-app --react --release 1.11-rc.0
1.10.3-beta was renamed to 1.11 as we have updated MongoDB driver and Node.js so a minor release sounds better in this case.