As thin as the tablet is, I can't imagine they could have possibly made it removable. Pretty sure if you don't see a slot on the outside, then it doesn't have one.
It is possible the SD slot is inside the SIM card slot, like the Xoom did. But back at CTIA the 10.1 was shown with separate SIM and SD slots. So I don't think anyone really knows what the final product is going to have.
Sadly I was hoping the details were going to come out tomorrow, but Samsung mysteriously cancelled the scheduled event. So... guess we'll find out someday.
Samsung Ativ Smart PC 500T, Nexus 4, Kindle Fire HD, Touchpad