I guess it depends on whether you registered it to the original account or not. If so then I imagine you'd only get the same free trial as any other returning player even if you have upgraded the account. That's the way I recall it happening with other games, if you have a base game and then upgrade it with say an expansion that includes the base game then you don't get the free gametime that someone registering the expansion to a new account would get. If you registered the new purchases to a new account then you'd get the full free trial. But that's just supposition on my part.