I finally tested it, now that my left arm half-works 
Both wifi and hdmi cec work. However, as with the build for s805, wifi reception/connectivity is poor and that leads to issues.
At the spot where my tv is, 2 wireless networks are available: mine (on channel 11) and the neighbor's (on channel 3), both at ~50% quality. Both routers are the same and we both use the same isp (adsl connection for me, vdsl for him).
I can connect to either one, because I do know my neighbor's key (and he knows mine), so I can test stuff from his connection too.
When I connect to my wifi, I go back to my pc and connect to the box via ssh (putty 0.74 on linux). The connection is unstable and typing gets laggy in less than a minute, so I abort it and go back to the box to continue. On the box, when I try to install almost anything, e.g. a skin or an addon from the main repo, I always get the message that downloading failed after a while. And this happens on either wifi network! So far, I have only managed to install the "essential" addons, i.e. virtual.network-tools, virtual.system-tools, vfs.libarchive, vfs.rar, inputstream.adaptive and inputstream.rtmp. And even those, which are small in size, were installed after a few retries and their download time was too much for their size.
And all that with the wireless connection not dropping at all all that time. I can see the relevant info under system info and in le settings. I mention that because I did have some connection drops with le on the box with s805, that's why I decided to gift it to someone else.
The above does not happen with ce for s905 though. The wireless connection is stable as a rock, lag on ssh is minimal to non-existant and downloads/installations happen in normal times and have never timed out so far. Why?