S4C HD will launch on June 7th.
Will it replace the SD version at 104/117 on the Sky EPG
, like BBC, ITV and Channel 5?
On 104, yes it seems: http://www.a516digital.com/2016/05/s4c-makes-return-to-hd-broadcasting-in.html
(NB 117 is C4 SD). With the recent addition of C5 FTA, that leaves BBC2 Wales as the last of the main five channels in Wales to not broadcast in HD.
Should be noted S4C HD - for that is indeed what they're calling it, no translation or revival of Clirlun - won't be on Freeview this time (for now at least), nor on Virgin except for the Euro 2016 games (some kind of temporary red button deal perhaps?)