just incase an update comes and we have to regenerate are worlds
Must... resist... urge... Aw, hell.
You won't have to worry about updates, believe me. Just go in expecting nothing to last forever. Also, notch and his lazy crew of travelers (Except for jeb, <3 Jeb) won't get the next update out intil AT LEAST 11/18/11. Also, you can carry over your multiplayer worlds. There's a thousand tutorials on youtube.