The contest will start on Sunday 2/21 and run for one month--so creator has one month to make the expansion. Redshift has two weeks to judge it.
As far as size, Sylon suggests not too big and not too small--but fun. That gives you room.
If you want to participate you should post in one of these threads that advertise the contest if you haven't already done so. Completed work should be sent to Sylon and Elendil at
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Entry has to be from Mithria. Game balance is a key feature in the judging as well as originality of story and gameplay.
Remember this will be offered as a free iphone/ipod expansion if the quality is high enough. Sylon will help polish the final product.
Good luck.