Here is the current (but ever-changing) plan:
Language Arts: MBTP 9-11, and MCT Town Level. I'll supplement writing with EIW 5 (just the second half, not the grammar) and/or Killgallon's Sentence Composing
Math: He's finished Singapore 6 and TT7 but I don't really want to move him on to a formal pre-algebra/algebra quite yet - So we are going to try doing Khan Academy for 20 minutes a day, and then a child-led exploration. I'm going to buy a variety of resources and let him choose what he'd like to work on. I'm thinking Beast Academy Online, Murderous Maths, TOPS Math, Patty Paper Geometry, Adventures of Penrose, Challenge Math, The Cryptoclub, etc.
Science & Social Studies: MBTP 9-11
Spanish: Senor Wooley, Homeschool Spanish Academy once a week, Duolingo.
Other activities: Hockey, Soccer, Rock climbing, Chess Club, Battle of the Books, Piano
Of course, this is a lot. But we'll experiment a bit and go with what works best.