Journalist and poet Mark Abley follows up the international success of “Spoken Here: Travels Among Threatened Languages” with a sort of travelogue from the cutting-edges of the English language. His purpose is to find out where our language is headed, as it spreads across the globe at an unprecedented pace. The resulting report is chock full of intriguing examples. (Ever heard the words “womlu,” “hippu hangu,” “noob,” or “yaya papaya”?) At times, it favors exploring English’s twists and turns — through Asia, hip hop, the Internet — to mapping and analyzing them. But the journey itself is thought-provoking.