The limitation was to prevent people from making more than one new character within the first thirty days of the setting. It's my understanding that you keep that slot if you didn't use it, leaving new arrivals (or those who've been present but haven't created a character) with two slots available.
The debate on introducing 2010 characters is still ongoing, so if you have only one slot left, you might want to wait until it's resolved before making another new character.
Hope that helps!
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The world is mine: blue hill, still silver lake,
Broad field, bright flower, and the long white road
A gateless garden, and an open path:
My feet to follow, and my heart to hold.