Silly doubt about GW + GW Factions

I suddenly came to wonder one thing: in this Beta Weekend I unlocked a few runes and skills for the Ritualist, but if I am to buy "GW: Factions", how will the Factions account link to my existing GW account so that what I unlocked in my GW account will be on my GW Factions account?

Probably it's a stupid question but...

the log in screen has a manage account choice and that page lets you add account keys

So it adds one account to the other? But if I add the cd-key, will it count as one single account with more slots and with the Canthia area, or will they still be like two separate accounts, so that if I'll make a new character using it I'll need to warn those who have my old one in their friends list?

Well, you have two scenarios and i'll explain each:

1) If you used your existing GW account (IE, used one of your PvP slots, etc): when you buy factions you add the brand new CD-key from factions to your existing account via the method Loviatar mentioned above. Doing it in this manner keeps your existing account, and add's factions content to it, and gives you an extra slot or two (number of added slots has not been determined yet).

2) If you choose not to merge the two accounts, you will get a chapter-2 only account with no chapter 1 content available, and 4 character slots. It can be, as this scenario implies, an autonomous stand-alone game by itself.

Having the ability to attach it to your chapter 1 account affords you the privledge of keeping all your hard work so far (unlocks, characters, etc).

The above two scenarios both assume you used a PvP slot on your existing account to play this weekend, and not that you used the free weekend key to make a completely separate account.