The Ricoh/Pentax Cashback action for K-3, K-50 and K-S1 in Germany and Switzerland is terminated January 10th, 2015!
€ 50 / SFr 60 for K-50 and K-S1
€ 80 / SFr 95 for K-3
For the K-S1 there is an additional Cashback Extra: a WiFi card (value € 100 / SFr 130).

For details and procedure see
http://www.ricoh-imaging.de/de/cashback-winter-2014.html

Edit:
I just saw my original link pointed to a version of the newsletter which contained personal data.
I now replaced it by a link to the original announcement.
The information concerning the cashback action is identical, just the info about CES is missing.