Relaunching or migrating a website is an intensive process and it's very easy for small issues to slip through the cracks. Here are some things to watch out for I've seen observing and being involved in several dozen migrations over the course of my career
AEM as a Cloud Service finally consolidates the login experience between AEM and the rest of the Adobe Experience Cloud. Learn more about the new default authentication for AEM as a Cloud Service, Adobe IMS
Performance is a critical concern for any web implementation. Users expect high performance, responsive web experiences and will abandon experiences that don't deliver. There are a number of different factors for ensuring Adobe solution performance.
The latest version of ACS AEM Commons, version 4.4.0, includes a new feature to fetch remote files and serve them via AEM. The primary use case I implemented this feature for was to automatically download the Launch by Adobe script so it can be served from the primary domain.