Global toroidal simulation using the GTC code for investigating the long time behavior of the confinement properties in magnetic fusion plasmas has been carried out in the past year by the researchers in the SciDAC Center for Gyrokinetic Particle Simulation for Turbulent Transport in Burning Plasmas (GPSC) on the state-of-the-art MPP platforms such as the XT3 and X1E at ORNL, the BlueGene at LLNL and the Earth Simulator in Japan. The excellent efficiency and scaling trend obtained for GTC on these machines have enabled us to carry out critical studies on particle number convergence as well as to study the new physics associated with the enhancement of zonal flow due to parallel velocity space nonlinearity. Looking ahead, we plan to increase the physics contents in GTC by including the magnetic perturbations and energetic particle effects and to march toward realistic simulations of ITER-type plasmas on petascale platforms in the future