GuiTexture + spritesheet unity 4.3

When i started creating my current project, I heard that unity will release spritesheets with 4.3. So i started working on it.
But I created my entire menu’s and hud using GUITexture. Please tell me i can use the spritesheets with that, because i don’t want to redo everything.

You can’t. GUITexture is separate from sprites and can’t use any sprite features.