As many theorized, Left Alive is indeed set in the Front Mission universe. The creators revealed that several Front Mission staff are working on the title and that it is set somewhere between Front Mission 5 and Front Mission Evolved. You will switch between three protagonists (featured on the key art) and fight Wanzers (but not only Wanzers).
Already at 50% complete, this Front Mission spin-off is a mostly offline experience divided up into stages. It was chosen over a direct sequel because the creators wanted to make a new lineup as well as get people to see the series from a different perspective than just "that robot thing."
via destructoid http://ift.tt/2w7dLC4