8.13 is a non-feature transitional release that is effectively Teiid 8.12 running on WildFly 9.0.2. Switching to the WildFly platform introduced several changes in configuration and how Teiid is built/kitted.
You will need to apply your Teiid and other configuration changes starting with a new base configuration for WildFly, such as the standalone-teiid.xml included in the kit. Note that 9999 port has been removed by default. Admin connections are expected to use either 9990 (http) or 9993 (https).
The Embedded Kit has been removed. You should follow the https://github.com/teiid/teiid-embedded-examples to use maven to pull the dependencies you need for your project.
There were extensive changes in dependency management for how the project is built. These changes allowed us to remove the need for resource adapter jars built with the lib classifier. If you need to reference these artifacts from maven, just omit the classifier.
WildFly 9+ is expected to use Java 1.7 or later. Both the server kit and usage of Teiid Embedded will require Java 1.7+. The client driver may still use a 1.6 runtime.