In the player's stats page, tournament tab, there is now a Game win ratios for 1 Player games. http://www.wargear.net/players/info/Toto/Player%20Stats

Is it a bug or a new way to show 2 player games when the second player did not join  ? 

Hopefully I won 100 % of my 1 Player games ;) 

Also, it seems that these games are not treated like a win/loss for the tournament global ranking, but I would like to have it confirmed.

If it's the case, I think it's not right as it is not encouraging players to surrender from tournaments as they know they won't lose points anyway, and it may allow them to chose who they will play against in RR tourneys  (only weak players for example) without any drawback for their ranking. 

It's a 'feature' of 1 player tournament games - I need to work out why those are allowed to happen instead of just being treated as a surrender.