I know the swatches aren't perfect, but they were taken in indoor lighting in the evening at an event, which kind of messed up with the swatch colours. I've tried to edit the colours to make them look better, but this was the best I can do.
Guerlain Ecrin 4 Couleurs for Fall 2014: Les Sables
First, Les Sables. This consists of a shimmery beige, a light warm peach/salmon shade, a light warm brown, and a deep neutral chocolate brown. This is probably on the warm side, undertone-wise, but is neutral enough to suit most people. It's pretty light, though - I'm close to NC20 in MAC, and the two lightest shades seemed to blend in with my skin, so that's an indication of how light the shades are. I'm sure that this is probably going to be the most popular shade, especially in this part of the world. It's definitely my favourite this season.
Guerlain Ecrin 4 Couleurs for Fall 2014: Les Violines
Next, Les Violines. If Les Sables was too boring for you and you wanted something darker, but you want something wearable with a bit of colour, Les Violines is a good choice. It consists of a light pastel lilac, a midtone violet lavender, a midtone warm plummy red-based purpoe, and a deep volet purple. The shades are primarily neutral or cool, with the exception of the red-based purple. When swatched, they all look quite neutral on me, though, so I imagine this would also be pretty universal on. This is my second favourite out of the lot!
Guerlain Ecrin 4 Couleurs for Fall 2014: Les Aciers
Lastly, Les Aciers. This is definitely the smokey, sexy palette out of the three. It consists of a matte charcoal black that's not-quite-deepest black and leans a little grey, and a very similar charcoal shade that is shimmery, a shimmery light silver, and a light neutral grey. This is not quite up my alley because I don't often do neutral, smokey looks, but I think it's great