Channel 4 in the UK aired the first season to a surprisingly warm critical and commercial reception, making it the highest-rated foreign language drama series to air in the UK for twenty years. Channel 4 said a while ago they'd be showing the second season, but no airdate has been set.
The Sundance Channel in the USA aired the first season, but it is unknown if they will also be showing the second. An inferior remake aired on the A&E channel in the USA last year, but was cancelled after one season.
A third (and apparently concluding) season of Les Revenants is expected to be filmed next year, hopefully to air sooner than the interminable three years between the first two seasons.