Hmm, I remember reading on Kotaku that it is coming to the PSP. I misread that, but the way it was written seems to imply that it was coming to the PSP.
But you are right, I could only find the DVD version. But you can always rip the DVD and put it on ther PSP
No foreign sky protected me,
No stranger's wing shielded my face.
I stand as witness to the common lot,
survivor of that time, that place.
- From 'Requiem' by Anna Akhmatova