According to John Gruber from DaringFireball, next-gen iPad could feature a carbon fiber body instead of aluminum body. He also added that he only half-sure of it, so don’t take this rumor too seriously. John Gruber also said that Apple has not changed anything in iPad 2 since January, and that he highly doubts a higher resolution iPad and inclusion of SD card slot.
Apple will announce iPad 2 on March 2. So now it just a matter of days before we know the truth.