Pre-purchase and account
No, if you applied the code to your existing account instead of making a new one then your account will be upgraded. At worst, if you made a new account, you would still have your old account, so nothing is getting deleted.
They should have given you a code either through your email or at the end of the purchase that you could apply.
No, nothing will be deleted. Your old account does not ‘require’ HoT in order to continue to play original content, just to play HoT content.
What will happen with your original account depends on what you did with the pre-purchase code. If you used it to create a brand new account, then you will have two accounts; your old account without HoT access, and the new one with HoT access.
If you’ve not used the HoT code yet, you can apply it to your existing account, and then you will just have the old account, and it will have HoT access on it.
Table Warfare Miniatures - Armatures, Custom Miniatures, Moulds etc.
No, if you applied the code to your existing account instead of making a new one then your account will be upgraded. At worst, if you made a new account, you would still have your old account, so nothing is getting deleted.
They should have given you a code either through your email or at the end of the purchase that you could apply.
I applied the code they gave me and it became HoT with my old account still in it, so that must be it. I was concerned I did something wrong
Do I have to use the new client or the one I already have works?
GW2 is becoming GW2:HoT automatically for anybody that purchases it. The current client of the game is the same one that will be used in the future. When HoT is officially released, all the HoT content will be available to you just by logging on as you normally would.