Superannuation –@supererogatory– has noticed that Square-Enix registered a domain for Just Cause 3: justcause3game.com. The game has been rumored (including its release date for Summer 2015) for a long time, but JC3 is still unannounced.
You can check the WhoIs information about this domain here.
This registration could suggest a possible E3 announcement (E3 will be held in Los Angeles in less than two months) from Square-Enix and Avalanche-Studios.
Thanks, @supererogatory