The latest Steam beta has been discovered to contain some interesting text strings hinting at the possibility of game-borrowing appearing in the future.
If you update to the latest beta (Steam > Settings > Beta Participation) and then look in Steam/Public/steamui_english you’ll find the following UI strings:
“SteamUI_JoinDialog_SharedLicense_Title” “Shared game library”
“SteamUI_JoinDialog_SharedLicenseLocked_OwnerText” “Just so you know, your games are currently in use by %borrower%. Playing now will send %borrower% a notice that it’s time to quit.”
“SteamUI_JoinDialog_SharedLicenseLocked_BorrowerText” “This shared game is currently unavailable. Please try again later or buy this game for your own library.”
Exciting times ahead! Hopefully an official announcement isn’t far off.
Source: Facepunch (thanks Stefan, JaMbO)