I just received a mail from ebooks.de about the PRS-T3s with description, available within 1 or 2 weeks.
http://www.ebook.de/de/product/21504...ion_weiss.html.
I don't think they could sell it without a back cover - surely it would infringe electronic product norms. Also with only 40g difference, it could represent only the front part of the PRS-T3.