I would hazard a guess that the new logo will save considerable pennies when it comes to painting and maintaining aircraft, and be more easily compatible with carbon-fibre surfaces.

Painting, and carting around heavy paint, is a significant cost factor over the life of the aircraft and refreshing the design can be both cost effective, as well as having the added opportunity to draw a line under the previous poor performance, and give customers and staff a tangible sense of renewal and a fresh start.