Q : How will this work with Maven? Won't it be annoying for developers to have to explicitly specify which module to depend on (and update this every time a Seam bundle comes out)?

We'll provide a so called "stack POM" [1], which users can import into their project. They then just bump the Seam version number:

<dependency>
   <groupId>org.jboss.seam</groupId>
   <artifactId>seam-bom</artifactId>
   <version>3.0.2.CR1</version>
   <type>pom</type>
   <scope>import</scope>
</dependency>