Guild Wars 2

It says:
The Ultimate edition will not be available as an upgrade and must be purchased as a full game package

Does this means i cant upgrade my account (this one) to a HOT account if i buy Ultimate?

It’s poorly worded, but I’ve heard you can use it to upgrade your existing account and get all the content.

You can. After ordering, you will get a Game-Key which you add to your existing account.

https://forum-en.gw2archive.eu/forum/game/gw2/Question-about-the-HoT-Prepurchase

Yes, you can… Don’t worry.