http://www.designworldonline.com/coming-revolution-high-strength-magnets http://www.designworldonline.com/coming-revolution-high-stre... (December 2014) seems t

http://www.designworldonline.com/coming-revolution-high-strength-magnets http://www.designworldonline.com/coming-revolution-high-stre... (December 2014) seems to give a wider overview of non-rare earth magnet development: FeN, MnBi, Ce and exchange spring magnets.