The blog post introduces the integration of Angular 2 and PubNub for building a real-time chat application, highlighting the transition from AngularJS to Angular 2, which offers improved syntax, component-based architecture, and TypeScript's increasing dominance. The post details the initial setup using the Angular 2 SDK for PubNub, emphasizing the PubNub JavaScript SDK's updates in its fourth release, such as isomorphic JavaScript and a new networking stack, which enhance performance across web and mobile platforms. It explains the creation of a basic chat app utilizing PubNub's Publish/Subscribe feature, message history storage, and the implementation of a straightforward user interface with minimal dependencies, using Angular 2 components to manage data and UI encapsulation. The guide further outlines incorporating multiple PubNub instances, event handling for messages, and using the PubNub JavaScript V4 API, while offering migration tips for developers transitioning from previous SDK versions. Finally, the post encourages engagement with future articles exploring advanced PubNub API features and invites feedback and suggestions for improvement.