So the new Twitter logo has landed, this is what Twitter had to say about the new design..
Our new bird grows out of love for ornithology, design within creative constraints, and simple geometry. This bird is crafted purely from three sets of overlapping circles — similar to how your networks, interests and ideas connect and intersect with peers and friends. Whether soaring high above the earth to take in a broad view, or flocking with other birds to achieve a common purpose, a bird in flight is the ultimate representation of freedom, hope and limitless possibility.
Personally I don’t think it was needed, however this is a nice video showing very briefly how it was born using a simplistic approach.