Grassland - +2 Food
Plains - +2 Hammer, +1 Food
Marsh
Forest - units can hide/recover in forests
Jungle
Desert
Snow
Tundra
Hills - Provide defence to units on them
Mountains
Coast - +1 food, +2 gold
Ocean
Lakes
Rivers - Affects defence/attack bonus when attacking across it, +1 Gold to surrounding tiles
I analyzed the game footage from the Gamespot and CivAnon videos and was able to get some info about the terrain. The errors in the previous list are due to the golden age and to the mouse-over depending where it stops. In the GS video the japanese are not in a golden age so when the mouse stops over japanese tiles, one can actually see the correct terrain values.
Plains: +1 hammer, +1 food
Grassland: +2 food
Plain forest: unit hide/recover, +1 food, +1 hammer
Grassland forest: unit hide/recover, +1 food
Hills: +2 hammer
Coast (ocean): +1 food, +1 commerce
Jungle: +2 food
Tundra: +1 food
Ocean: nothing
From what I saw, golden ages provide one additional hammer and commerce to all tiles. Also roads seem to not give a +1 commerce bonus anymore. Forest tiles don't give any hammer which seems really unusual but the videos confirm that. Guess it makes chopping more obvious.
In the CivAnon video at 0:37, we can see three cities which are very close together. But two of them only provide 4 hammers, 1 commerce and no food at all so I guess they were captured and are now puppets govs. You can also see a great general just being born, it has a movement of 7 and no strength.
Ressources:
Bananas (with plantation): +2 food, +1 commerce
Horses (with pasture): +2 hammer, +1 commerce
Iron (without mine): +1 hammer, +1 commerce (you can see the quantity of the ressource on the map, seems random between 2 and 5)
Siege weapons promotions:
Barrage 1: +25% ranged combat strength against units in ROUGH terrain (hills, forest and jungle)
Accuracy 1: +20% ranged combat strength against units in OPEN terrain (no hills, forest and jungle)
Wonders:
Pyramids give free granaries, it's 100% sure (GS video 1:35, you can see a granary and a "(free)" behind).
[edit] Added some terrains, iron, siege weapons promotions, modified hill.