Is Java 9 modularity for WAR files as well?

Question

A Java EE 7 application server, and specifically a Servlet 3.1 container should allow us to deploy a WAR file that contains a web application. And a WAR file is essentially

Answer 1

So, can a WAR file contain a module descriptor as well and make a "modular WAR file"

Yes, it can. Since it could now essentially be Modular JAR file with deployment descriptors like web.xml.

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Generally what is the future of servlet containers and WAR files in terms of Java 9 modularity ?

From the Dynamic configuration aspect of the module system,

For the Java EE Platform, in particular, the goal is to enable a future modular war-file standard in which the components in a war file can be developer modules.

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Are there already application servers capable of accepting deployment of a "modular WAR file"?

Though I am currently unaware of any such existing tool or servers, yet a capability to create Modular Jar is already added to JMOD and JAR tools which provide a futuristic view of the integration of application servers and module system.