In order to help over-saturation of newbie grounds Sigil has limited all accounts to only 8 characters per account. It is unknown if the change is permanent, or will only last as long as the newbie rush is going.
Some suspect that its permanent that SOE wants to force you to buy multipal accounts if you are a big Vanguard fan, like they did with SWG.
Others simply think its a temporary population control. I tend to fall on this side of the fence, given the nature of the quote:
Originally Posted by Glip the Gnome:
Looks like 8 (characters, not per server) for now.