scaled-down, pre-taped, one-hour ceremony, will probably tell us a few things we already know about this year’s awards races, and maybe a few things we don’t about a couple of tight races.The chances that they can create turmoil in the Best Actor and Best Supporting Actor races are slim, but there’s a lot at stake in the two actress categories at the SAG Awards, and the opportunity for the guild to christen real front runners.Carey Mulligan, Frances McDormand or Viola Davis? Maria Bakalova,