Price bumps are usually fueled by good news circulating over the interwebs. As someone has already pointed out, CME group announced that they'll be having their own bitcoin futures by mid-December. In line with this news, other financial institutions also stated that they will also look into having one, thus driving some opportunists into bitcoin to not miss future growth opportunities. Also, demand-wise, there is a huge volume being traded everyday and the numbers are gradually increasing. You might want to check that out as well.