The 90-mile marker at the edge of Key West points south to Cuba. The number resonates among Cubans on both sides of the Florida Straits; noventa stands for separation, for hostilities and suspicions, for yearnings and pain, for hope. 

And it's the title of Gloria Estefan's first Spanish-language album in seven years, 90 Millas, released Tuesday. 90 Millas is the 25th album in the career of Miami's biggest homegrown superstar, and it signals Estefan's return to the public eye and ear after a blockbuster show at AmericanAirlines Arena three years ago marked her retirement from tours.