Now, with -with-tools using <scope>import</scope> to fetch other BOMs instead of pasting their content inside, order of these definitions becomes crucial.
Current order is wrong, as Arquillian BOM contains both ShrinkWrap and ShrinkWrap Resolvers, thus dependencies specified later on are omitted.
Instead, you need to specify them in current order:
1. Java EE6
4. Arquillian Core
resolved in http://git.app.eng.bos.redhat.com/?p=jboss/jboss-bom.git;a=commitdiff;h=671a4b996b97fa4c3fc7443af5efd3f19a2222f9
Verified on 2.3.0.ER1