WildFly 8.1.0.CR1 is available here: http://wildfly.org/downloads/
Currently runtime detection does not work properly - that is tracked in JBIDE-17102 .
And when 8.1 is added manually, a warning is displayed that this is an unsupported version.

We need to figure out if we need a new adapter for this version or support it using the current one and if so, rename it to 8.x perhaps.