There is a lot of talk about Hearthfire floating about so this thread is to compile all known info for Skyrim Hearthfire in an organized way. Expansion. Please add any new updates or other information/rumors you know about, and I will update the OP.
Note: I used these sites as source:
http://www.gamesas.com/topic/1406947-hearthfire-discussion-thread-6/
http://gamesas.com/en-us/games/hearthfire
http://www.youtube.com/watch?v=7gXwNVpDmfo
http://www.rarityguide.com/articles/articles/3299/1/Skyrim-Hearthfire-Guide-Part-1-Introduction/Page1.html
http://orcz.com/Skyrim:_Hearthfire
Release Date
Xbox: Sept 4, 2012
Pc, PS3: ???
cost
$5 or 400 MS points
Features
Adoption System
Adopt a child, play games
Housing
Buy a land, build house,decorate rooms
Spouse can move in with you
(Note: land can only be bought in Hjaalmarch, Falkreath and The Pale holds)
New Crafting Stations
Drafting Table
Carpenter Table
Personal Bard
Can entertain you in your house
Trophy Room
Collect hunting trophies
Personal Steward
Can help decorate your house and give you carriage rides
New Objectives
Protecting your home from intruders
Some more details:
1. The carriage locations include villages such as Dragonbridge, Darkwater Crossing, Ivarstead, Karthwasten, Kynesgrove, etc., places that aren't currently served by carriage.
2. You get a beehive to harvest. Hive looks like the ones at Goldenglow Estate.
3. Shrine room, which has all the shrines.
4. (Probably already mentioned) Trophy room, just like the stuffed trophies at the Castle in Oblivion.
5. Noticed in the fish list, "salmon roe". Not something I've seen before, and it's not in any of the game wikis.
6. New items such as straw, iron fittings, nails, etc, for the house.
7. The two kids in the trailer you can adopt are Lucia (not in the game wikis, must be new) and Gralnach (from Heartwood mill, near Riften).
Updated the OP With new info