I don't know if any live broadcasts will be 4K in Canada. In 2016 several providers carried delayed 4k versions of some events on their VOD service, so keep your eye out for those if you're really keen on 4K. I think the opening and closing ceremonies were available in 4K.
CBC RISES EARLY FOR LIVE COVERAGE OF THE PYEONGCHANG 2018 OPENING CEREMONY, FEBRUARY 9 BEGINNING AT 5:30 A.M. ET (2:30 A.M. PT)
A primetime broadcast of the Opening Ceremony will air on CBC at 9 p.m. ET (6 p.m. PT) on February 9, and it will be available on-demand as well at cbc.ca/olympics that day.
CBC REVEALS BROADCAST AND MULTI-PLATFORM COVERAGE OF PYEONGCHANG 2018, KEEPING CANADIANS CONNECTED TO ALL THE ACTION
All in all, CBC will broadcast 21 hours of Olympic Games programming daily, keeping the early bird, the night owl, and everyone in between, up-to-date on what’s happening in Pyeongchang, South Korea.
In addition, broadcast partners TSN and Sportsnet will once again expand the volume of live event coverage available each day, giving Canadians multiple options as to what to watch on TV, while TLN provides the option of watching select hockey games in Italian and Spanish.
7 p.m. – 2 a.m. ET (4 – 11 p.m. PT) Olympic Games Primetime – LIVE
2–6 a.m. ET (11 p.m. – 3 a.m. PT) Olympic Games Overnight – LIVE
6 a.m. – 12 p.m. ET (3–9 a.m. PT) Olympic Games Morning – LIVE
12–1 p.m. ET (9–10 a.m. PT) Olympic Games Hockey – LIVE
3–5 p.m. ET (12–2 p.m. PT) Olympic Games Afternoon
5-6 p.m. ET (2–3 p.m. PT) Olympic Games Hockey (encore broadcast)
EDIT: see the press release for details on the CBC Olympics app, the VR app, radio, social media etc.