"New motto" refers to a fresh saying or slogan that represents a new belief, goal, or guiding principle. It is a concise expression summarizing a new mindset or attitude. Full definition
At his Noncuratlex blog (via PrawfsBlawg), Kyle Graham has undertaken an interesting project: to propose new mottos for other law blogs that he likes. (legalblogwatch.typepad.com)
Now she has a whole new motto: Kiffe Kiffe Tomorrow. (bookbrowse.com)
Still, customer requests went unresolved in HP's «technology supermarket,» so she promulgated a new motto: «Run to the fire.» (fortune.com)