There have been two spectacular attacks over the last few weeks. They came after the 'end' of the Swat military operation, and after Baitullah Mehsud's was killed in a suspected drone attack. (Notably, Mehsud was not killed by the Pakistan army, but by the United States. None of the Taliban leadership was killed or apprehended in the Swat operation.)
The most recent manifestation of the 'return' of the Pakistan Taliban is the audacious attack on the Religious Affairs Minister, Hamid Saeed Kazmi, in the federal capital earlier this month. A sniper on a motorbike opened fire at the minister's car in broad daylight, chased him on a main road of Islamabad, and riddled the car with at least 25 bullets. The minister was injured, his driver killed and a police guard injured in the stunning assassination attempt.
Watch for the US to get more involved on the ground in Pakistan much more at this point, as covertly as they can, and watch for US drone attacks to get stepped up.