Defenceman Kris Letang has been activated from long-term injured reserve, the Pittsburgh Penguins announced on Tuesday. The move comes hours ahead of a game against the visiting Florida Panthers, which can be seen at 7 p.m. ET / 4 p.m. PT on Sportsnet. The veteran defenceman is expected to be in the lineup for the clash. Letang, 35, has not played since suffering a lower-body injury on Dec. 28. The Penguins placed defenceman Jan Rutta on LTIR, retroactive to Jan. 14, and forward Kasperi Kapenen on injured reserve, retroactive to Jan. 18. The 35-year-old Letang has had a difficult season,…