Even if the controller supports SDIO, you would still need a firmware update with drivers and a way to interact with the wireless. It would also need some kind of input device hack to enter WEP/WPA keys. I don't see it happening.
My thinking is Sony is sticking with its Memory Stick fetish as they have done all these years, and added SD support to appeal to a wider range of people. SD and memory stick card slots are seldom fitted with a cover, usually they just stick in a dummy (which is exactly how I got my 505, with 2 dummy sticks). Or possibly they wanted you to have the books in the memory stick slot, and you can quickly and conveniently slot in an SD card with pictures from a camera or something.
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