Dani,
The picture shown is of the 787-3. This is the short range version of the 787 series and its aimed at replacing A300s and domestic 767s. Its lightened and strengthened to deal with higher cycles / shorter sectors. It has a different wing compared to the other two variants because of this.
The other two variants, the 787-8 and 787-9 are the longer range versions (which would likely replace 767-300ERs and 767-400s) and have the curvier version of the 767-400 wing tip. This is also being applied to the 747-8.