I've been following the development of the Meteor platform for a number of years, and it is very interesting to see some of the recent changes.
Meteor 1.3 is the first release that really manifests the adjustments that are being made.
The big ticket item in this release is support for ES2015 (aka ES6) Modules. While Meteor 1.2 added support for ES2015 syntax, full support for modules was not included.
Mobile Support via Cordova Greatly Improved
Meteor 1.3 now uses the latest version of Cordova (6.0.0) and on iOS now supports WKWebView for dramatic performance improvements. Hot code push for mobile apps is also greatly improved:
On the Horizon
Next up in Meteor 1.4 we expect to see an upgrade of Meteor to Node.js version 4 and MongoDB 3.2. I'm looking forward to those improvements!