It appears to be like the Thoughts of the Day on the whiteboards we've seen on some Tube stations. Satre, Gandhi and Einstein are some of the great thinkers you'll be hearing on your journey. The quotes include "An ounce of action is worth a ton of theory" and "A stumble may prevent a fall" to the more philosophical "The afternoon knows what the morning never suspected".
I wonder what bought about this change of heart? What do you think of the announcements and have you heard any yourself yet? The lady at the end of the BBC piece about the announcements, thinks they're a good idea but says that she'd be driven mad by them if there was a quote at every stop on a daily commute.