http://bugs.winehq.org/show_bug.cgi?id=24576
--- Comment #2 from John Moffatt senjion@gmail.com 2010-09-30 19:51:37 CDT --- Progress.
Running the following: WINEDEBUG=+winsock,+relay,+winhttp wine "c:\program files\squareenix\final fantasy xiv\ffxivboot.exe" &> /tmp/ffxivtrace.txt
Brings not only lets me get past the login screen, but also successfully launches the game!
I can get to the Start Screen as per the attached image file, however clicking "Start" launches a Login Client which looks to be a developer mode login (the Program is appended with "DevMode").
While I still cannot test gameplay it seems to be one step closer to it.