This seems like a decent summary of Garde (from a Spurs fan admittedly):
http://cartilagefreecaptain.sbnation.com/2014/5/14/5716440/remi-garde-tottenham-hotspur-manager
Tactically flexible, sound experience at youth and academy level and a preference for possession-based football, but supposedly horrendous at the back. May also be willing to work under the various constraints of our system as apparently Lyon's owner (Aulas?) has been asset-stripping over the last few years.