Mayfair Games has announced the September release of Catan Scenarios: Helpers of Catan (MSRP $5), small expansion for a very big game, Settlers of Catan, which was rated the #1 board game inf 2012 by ICv2 (see "Top 10 Board Games--Fall 2012").  This scenario for from 3-6 players was written by Catan creator Klaus Teuber.  This expansion, which also works with Seafarers, includes 10 hardworking people with the skills and experience to help players create vital and successful settlements.
Catan Scenarios: Helpers of Catan comes with 10 double-sided helper cards and 1 rules sheet.  A much more elaborate expansion, Catan: Explorers & Pirates is also shipping from Mayfair in September (see "'Catan: Explorers & Pirates' 5-6 Player Expansion").