ESPN’s long-term basketball broadcast plans are coming into focus. The network will announce Thursday that it has reached multi-year extensions with a quartet of basketball voices: Tim Legler, Kendrick Perkins, Monica McNutt and Chiney Ogwumike, according to sources briefed on the move. As far as specific assignments, per the sources, Legler will expand his role as part of his extension by serving as an ESPN NBA television game analyst. He will also regularly appear on “SportsCenter” and “Get Up