When you go back from the very first singleplayer World Creation Screen (as I don't have any SP worlds yet), the splash text changes. When you go back from the world creation screen after you have already created a world, or the multiplayer server list, it doesn't change.

Steps to Reproduce:
1. Start Minecraft without any singleplayer worlds. Remember the splash text.
2. Go to Singleplayer World Creation screen
3. Go back with "cancel" and observe how the Splash text changed (try again if the splash text remained the same, there is a small chance to)
4. Actually create a world, exit it, and try step 2 and 3 again. Now the splash text will not change