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There are a lot of rumors and speculations that Apple’s second generation of iPad may have an SD card slot. The conclusion was based on the photo on an image of a new iPad 2 case from a manufacturer of Chinese accessory. The case has two additional slots (a left-upper slot and a top-middle slot). It was speculated that the left-upper-slot is for the SD card while the top-middle slot is for mini DisplayPort jack.

However, AppleInsider reported that the slot is not actually for memory cards Instead, it is actually the new location for the iPad 2 SIM card slot:

“In a mockup analysis of all the openings and recesses in those cases, it was speculated that that left-side opening could represent the much-rumored SD Card slot. However, a person that AppleInsider trusts on matters such as these has since rebutted that notion, stating instead that the break in the next-gen iPad enclosure at that location is actually a relocation of the tablet’s SIM card slot.”

AppleInsider thinks that: “That may explain why some of the other next-gen iPad casings making the rounds don’t sport the same opening, as users of 3G iPads aren’t likely to need ready access to the SIM slot on a daily basis. And like Gruber’s sources on the subject, the same person referenced above gave no indication that there’s an SD Card slot elsewhere on the device.”

The current generation of iPad does not come with SD card slot. However, users may use the camera connection kit that costs $29 to transfer photos from an SD card to the iPad. There are a few things that must be considered here. If the slot in the left upper slot is for the micro-SIM, then the slot may be quite big for it. However, it seems odd for a case not to have a slot for SD card. Thus, we think that it is either for SD card or the case is fake.

We already reported about the possible inception of iPad’s second generation. We also heard a lot of speculations and rumors regarding the Retina Display of the gadget. iPad 2 is expected to be released on the end of March and April.

MacRumors found new graphics in iBooks application that are in need of higher resolution suggesting that iPad 2 may come with a display with twice the resolution of the first iPad. Thus, iPad 2 will have 048×1536 screen resolution at 260 DPI compared to current iPad’s 1024×768 screen resolution at 132 DPI.

MacRumors released a statement saying that, “Based on Apple’s marketing efforts for the original “Retina” display, it would suggest a DPI (dots per inch) greater than 300 to exceed the abilities of the human eye. A more practical approach would simply be doubling the resolution of the current iPad (1024×768) to 2048×1536 at a 260 DPI. While not quite a “Retina” display, it would follow with Apple’s efforts to avoid fragmenting their product line. From a developer’s perspective, the doubling of an existing resolution is much easier to support. Apple similarly doubled the iPhone’s resolution from 480×320 to 960×640 when they introduced the iPhone 4. Like on the iPhone 4, older apps can simply run pixel-doubled while native apps will take advantage of the full resolution of the new screens.”

MacRumor also adds that, “The “Retina” definition is based on a specific distance the device is being held from your eye. Since an iPad display would likely be held farther from your face, it would require a lower DPI to achieve the same effect.” This could also be the reason why Apple is planning to use the next generation GPU in future iOS devices and Cortex A9-based multicore processor.