Retailers are receiving their solicitations for Mirrodin Besieged, these documents are what the stores use as a basis for how much to order of various products. In the solicitation we discover that the Mirrodin Besieged Fat Pack is going to undergo three changes:

1. Addition of 1 booster pack, bringing the total to 9 booster packs
2. Addition of 40 basic lands, bringing the total to 80 basic lands
3. 2 60-card deck boxes (likely cardboard, such as for theme decks)
4. Increase in MSRP to $39.99 USD from $34.99 USD

The additional land is most likely due to the prevalence of Fat Packs as a purchase for newer players, thus providing them with more lands to use in deck construction. The added booster pack brings the Fat pack up to three "draft sets" making it more attractive to buyers.

They will also have the additional items:

1. 1 Card box
2. 1 Player's Guide
3. 1 Spindown life counter

Update: We've updated our listing to include the deck boxes as a new item. We overlooked them in our initial posting.