Best case scenario: Nothing will happen. It will swear at you and tell you that you can't add a trial account to a retail account.
Worst case scenario: You will be trial-account limited for 14 days, which will be free, but you won't be able to play any characters over L13, or get any new characters above that level.
The Best Case is more likely.
The wisdom of Shadowe: Ghostraptor: The Shadowe is wise ...; FFM: Shadowe is no longer wise.
; Techbot_Alpha: Also, what Shadowe said. It seems he is still somewhat wise 
; Bull Throttle: Shadowe was unwise in this instance...; Rock_Powerfist: in this instance Shadowe is wise.; Techbot_Alpha: Shadowe is very wise *nods*; Zortel: *Quotable line about Shadowe being wise goes here.*
1 of 2 things will happen
1) you will get a 14day trial account (in addition to your retail account).
On the other hand though, if your game account was inactive for a period of time (or you never applied had a trial account) i *do* believe that you could get 14 days free.... but this can also depend on how that trial code was set up. (I actually used a trial code to re-activate my CoX account for the Omega Sektor event seeing as it was inactive for a LONG time, and never started from a trial code)
Well I put in a support ticket to ask and the response I got was it was being upgraded to Senior Support Staff. Obviously they don't even know what's gonna happen
The above is only my opinion, please don't hate me for it
SG: Suicidal Maniacs @Aurealis
GhostRaptor: Server populations have been trending upwards since Issue 13 release. There are no current plans for any server mergers and we're looking forward to Issue 14 and the rest of the year.
More than likely, you will get a new CoX trial account to play around with.
But then again the trial codes strictly speaking are *not* meant to be applied to an existing account, so therefore there might not have been a test (as it were) to see what would happen with it.
well this has probably been asked already but nevermind.
I got some free trial serial codes on my account a while back, one for Tabula Rasa, one for Lineage 2 and the other for CoH.
Obviously i'm already subscribed to CoH and i'm just wondering what will happen if applied it to my account. Will it make any difference?
The above is only my opinion, please don't hate me for it
SG: Suicidal Maniacs @Aurealis
GhostRaptor: Server populations have been trending upwards since Issue 13 release. There are no current plans for any server mergers and we're looking forward to Issue 14 and the rest of the year.