For anyone who will have problem with the opening of the app:
1) Open Terminal
2) Right click on World of Warcraft and select "Show Package Content"
3) Browse to World of Warcraft/Contents/MacOS/World of Warcraft. The icon should be blank, and the ...
...and for those people that already have the 3.4.3 native client installed? I don't see why i have to play on another OS (virtualized or whatever) when i can play on my own.