So after this CES I tried to create a (mostly) complete list of devices, set-top-boxes, TV, etc with official Android TV. As you can see it's quite a long list and if you find other devices, just reply ;)
Set-top box (TV and internet providers)
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Bouygues Telecom - Bbox Miami (France) https://www.bouyguestelecom.fr/offres-internet/bbox-miami
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CCC – Air Stick (Japan) https://www.cccair.co.jp/airstick/index.html
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Dish AirTV (USA) https://www.airtv.net/player/
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Freebox mini 4K (France) http://www.free.fr/freebox/freebox-mini.html
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KT SkyLife skyUHD A+ (IPTV provider from Korea) http://www.skylife.co.kr/service/goods/androidTV.do https://www.youtube.com/watch?v=Y-uNXsuLiSs
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LEONET Life Stick (Japan) http://www.leo-net.jp/special/7-renewal_point1.html
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Partner (Israel) http://www.ynet.co.il/articles/0,7340,L-4892979,00.html
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Stofa (Denmark) http://www.broadbandtvnews.com/2017/01/09/stofa-launches-android-tv-box-kaon/
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TIMvision (Italy) https://www.tim.it/tv/nuovo-decoder-timvision
Televisions
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Arcelik (Turkish) http://www.arcelik.com.tr/android-tv/
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Bang & Olufsen http://www.bang-olufsen.com/en/collection/televisions
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Beko (Turkish) https://www.beko.com.tr/android-tv/
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Grundig http://www.grundig.com/de-de/tv/tv-linienprogramm/alle/55-gub-8688-a
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LeEco Super4 http://us.lemall.com/us/tv/leeco_super4_x65/index.html
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Philips http://www.philips.co.uk/c-m-so/televisions/p/android-tv
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Skyworth https://twitter.com/jank0/status/817818529961385985
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Sharp (Hisense) https://www.android.com/tv/sharp-aquos/
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TCL (Xclusive X1, X2 and X3) http://www.tcl.eu/en/x1/android-tv
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Thompson (TCL) https://twitter.com/Thomson_FRA/status/817699339409780736
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Vestel (Turkish) https://www.vestel.com.tr/vestel-android-4k-55ua8990-led-tv-(55-inc)
Gaming/Streaming box
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Asus Nexus Player https://www.asus.com/us/Home-Entertainment/Nexus_Player/
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Nvidia Shield TV https://www.nvidia.com/en-us/shield/shield-tv/
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Razer Forge TV https://www.android.com/tv/razer-forge/
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Xiaomi Mi Box https://www.android.com/tv/xiaomi-mi-box/
Have you seen the google pay app store tho? I have an Apple TV 4th gen and a couple of android TV boxes and I can practically check the Apple app store every day for new apps. Android TV seems to be frozen in time.