Anyone who can read this, feel free to clarify if there's any more info my Rikaichan and Google translate missed. It didn't seem to say very much.
Not much indeed.
Though it does mention apron + gym uniform cosplaying! And that it'll be released by Wanibooks, if that matters to anyone.
And that it's not actually just a photobook of WMatsui; rather, it'll be the 'official book' of DeraSKE, which may mean other SKE members may get in on the cosplaying fun!
Edit: More stuff included, mentioned on
natalie.mu:
- not just apron + gym uniform, but also yukatas!
- battles between Team Jurina vs Team Rena (Is that how they're referred to in the show?) + offshots of the show
- profiles of the teams
- team correlation chart
- WMatsui interview
- report about the DVD release event
- first edition also has signed goods (I'd guess photo cards, but it's not mentioned specifically) inserted randomly!