Actually, at the moment, they stay in Flesh it Out. (Check all the other New Takes and New Race posts.) Eventually they settle towards the back pages of the forum. Someday, when Strolen V2 goes up, they will be in their own lifeform section.
Remember, nothing is ever really done and locked. Everything here is open to reinterpreation and comment. Besides, in a few weeks/ months, you might have a great idea you will want to add in. It does not seem like it, but trust me... it will happen.
Things you think are dead and buried sometimes get a new life of their own. My own Neversummer keeps popping back up. And you can always shepard your posts into more current positions by bumping them.
Some things do get moved. If they have a list like, or continuous additive quality, then they go to idea scroll. If they are setting like, they can go to the setting forge (setting based posts that get too big, get their own forum). Yet things that have neither quality, they stay in the flesh it out area. Flesh it out should be called "Open Ideas" in my opinion... but that is for another post.