If i purchase The Cataclysm guide now will i get free update to MoP, as want to start using Dugi again but haven't done so since Lich King, but want to do it now rather wait to purchase MoP update.
I am not staff, but from what Dugi and the staff have said, I do not think so. I think they are referring to new guide purchasers not upgrade purchases. I say that based on the join date under your avatar, believing that you have previously purchased a guide back in 2009.
For a definite answer you will need a response from one of the staff.
Unless you meet the criteria of Loyalty program or Grace period, you won't be receiving the MoP for free.
But if i upgrade to MoP does it include Cata content?