I got my R4 today from RHS, and it appears to be different. For one, there is no spring in the MicroSD loading Mechanism, it simply slides in and you can pull it out. Also, mine came in a different box- It uses the standard R4 box with the green "R4" in bold, but underneath is a smaller white box with "R4' in grey text. Is this normal?
I don't know about the box, but my R4's sd slot is the same as your's. I bought mine for divineo about three weeks ago.
Oh, I also believe the R4 was supposed to come with a replacement case, a white one, in case your DS was white- you could change the color of your R4. I guess they don't ship that anymore-like the CD.
That's a redesigned R4. It was announced a few weeks ago; some people were complaining that the spring mechanism was prone to failure so they decided to alter the original design.
Edit: read more here: http://ds.qj.net/R4-shell-now-improv.../49/aid/103644