This is my ideal age creation tool:
You start out with a few sample complete descriptive books, which you can peruse within the program, and simple ages which they describe. Every symbol in them is automatically uploaded to your partial lexicon, although you don't necessarily know what they mean. You can borrow complete phrases from the sample texts to add to your own blank book, or pull individual symbols from the lexicon. You save your work by either saving your progress, or having the program convert your blank book into an Age, which you then explore (maybe in a low-quality setting). Slowly you begin to figure out what each phrase means, and then each symbol, and you can record your notes inside the lexicon. We all collaborate to discover what the phrases mean. Eventually, we will be able to write just about whatever we want to, and have the computer invent an age matching the description. Essentially a computer-simulated version of The Art.
This is what I'd realistically like to see in Age Creation tools:
Probably a WYSIWYG Age editor, with elementary controls for all the age basics. I don't know, anything Cyan decides to give us would be good.