I have managed to make NetBeans find WildFly plugin.
I had NetBeans 8.0 on my machine installed. For now, if you need to use WildFly from NetBeans - the answer is to install the latest NetBeans Nightly build. I have installed the following JEE bundle: http://bits.netbeans.org/download/trunk/nightly/latest/
So, I have added WildFly and in NetBeans IDE Build 201404150001 it works: http://s29.postimg.org/n3zi8k2qf/Wild_Fly.png
UPDATE: I've written about this in twitter, and guys fixed this! Now everything works fine in NetBeans 8.0. Thanks everybody.