The lightning traded Nikita Alexeev to Chicago for Karl Stewart and a 6th round pick. They also acquired Jason Ward for a 5th round pick. Sad to see Alexeev go, but his play hasn't been too good lately.
This is per Spector's Blog post.
Looking around for other confirmation though.
Update- they are on tsn.ca's tracker.
The Lightning have acquired a 3rd round pick and defenseman Shane O'Brien from Anahiem for goaltender Gerald Coleman and a first round pick according to TSN.ca