Team Angular has released Angular 5.2.0, a minor release containing several bugfixes reported in version 5.1. Angular 5 was released in November last year and this is the second update within a period of two and half months.
As stated in the official blog, the three major improvements include –
"Improved type checking for templates
We’ve added fullTemplateTypeCheck as an angularCompilerOption that uses TypeScript to validate binding expressions in your templates. We recommend you enable this flag, as it will become the default in a future major release.
Support for TypeScript 2.6
Angular now supports TypeScript 2.4, 2.5 and 2.6. Check out some of the new features in TypeScript 2.6.
Improved Router Param & Data Inheritance
Previously, nested routes would only inherit parameters and data from parent routes if the parent route did not have a component set. Now paramsInheritanceStrategy can be set to always, meaning child routes will have access to all ancestor parameters and data."
Apart from these, there are many more changes. You can go through the
Angular Changelog on GitHub for the complete list of changes, improvements, and bugfixes.