Claims that the next-generation iPad would get an SD card slot were partly challenged today with a countering leak. The corner opening opposite the volume rocker, which some have taken to be an SD slot, is now said to be just a relocation of the micro SIM slot from its previous position towards the middle of the tablet's edge. AppleInsider's trusted source for the leak didn't say for certain that an SD card slot would be entirely absent but helped explained cases that didn't have the slot, since few 3G iPad owners are likely to constantly swap SIM cards and hop betw