informed
abreast, acquainted, au courant, au fait, briefed, conversant, enlightened, erudite, expert, familiar, genned up (Brit. informal) in the know (informal) in the picture, keeping one's finger on the pulse, knowledgeable, learned, posted, primed, reliable, up, up to date, versed, well-read
well-informed
acquainted, au courant, au fait, aware, clued-up (informal) cognizant or cognisant, conversant, educated, informed, in the know (informal) knowledgeable or knowledgable, understanding, well-educated, well-grounded, well-read, well-versed