Many of the lego modular buildings like the Green Grocer and Cafe Corner have been very useful for parts in the Castle MOC community. However the new 10211 Grand Emporium seems to be the best of the bunch.
There are more pictures over here
at Eurobricks. At first glance it is obvious that the entire building
is made out of primary castle colors. Light Bley, Dark Bley, and Tan.
It is almost easier for me to point out the parts of this set that are not readily used in castle MOCs. Many of the figs torsos would be tough to incorporate into castle. However, the governors daughter's dress from the pirate line is available in this set. The legs and hair pieces are very usable as well. The windows in dark green, the large glass windows and doors may be a bit difficult to put into a castle MOC. The awnings will have some but limited uses. A few other small accessories may have a limited use as well, but there are very few of them.
What is included that I have noticed so far:
This set appears to be built on a tan 32x32 baseplate. These are tough to come by and go for over ten dollars on Bricklink.
More light bley, dark bley, and tan tiles than you can shake a stick at.
The new half arches in lt bley and tan. The number included is huge for a brand new element. (atleast 22 lt bley and 4 tan) I imagine these will be expensive for a while.
Lt bley cheese wedges atleast 16.
A whole lot of plates also in the primary 3 colors.
Tan 1x4 arches useful for tan castles.
Some light bley profile 1x2 bricks.
Light bley 1x1 rounds.
Tan 1x2 log bricks.
Even the flags and poles hanging outside of the store are immediately useful.
Last but not least. It appears that the entire back side of the stores walls are done in lt bley bricks. And 2 walls times 3 stories high will make for an aweful lot of lt bley bricks.
I imagine once I can see the brick count on the side of the box it will be even better than I am imagining. Here's to March when I can pick up a set that will be very useful for my castle building.