Nope, you'll be free to add/drop players as you normally would. Trade deadline only locks movement of players from one team to another!
Useful because if you're in the finals and a player isn't playing anymore, you can drop him to add another for the spot-start (but don't do this if you're in a keeper league)
12-team H2H Yahoo League
2C, 2LW, 2RW, 4D, 1UTIL, 2G
G, A, +/-, PPP, SHP, GWG, SOG, HIT
W, GAA, Sv%, SO
C: Benn (LW), Marchessault (LW), Galchenyuk (RW)
LW: Ovechkin, Marchand, Pacorietty
RW: Rust (LW), Buchnevich, Fiala (LW), Zuccarello
D: Josi, Theodore, Sergachev, Dahlin
G: Mrazek, Khudobin, Sorokin
IR: Grzylcek