This Samsung was only introduced at IFA, so it probably isn't shipping yet. The others like the Sony were introduced at last year's IFA, so they are being replaced with the next/second generation models. Samsung is offering a seperate inputbox/with DVB-S2 receiver, because of the lacking H.265 and HDMI 2.0 chips, so it can easily be swapped for a box that offers the latest in connectivity.
Eutelsat is carrying four demo channels I believe, the Samsung Channel, an H.264 channel and a second in h.265 run by Eutelsat/Ateme, and a fourth one I can't remember the details of (Panasonic?). Astra is also running a couple of demo channels.
Broadcom announced it started shipping its first H.265 decoder chips, but there are no front-end chips, yet.