64bit Client CONFORMATION?

Hi i was messing with the settings in my client and saw the completly new option (to me anyway) Could this be the long awaited conformation that 4.3 may contain a 64bit version of the client.

Let me know what you think peeps?

link to the image here as im a new user here

http: / /

i1223.photobucket.com/albums/dd511/Tom_Caulton/MMOc64bitconformation.jpg