Later in the trailer we saw Jon and Littlefinger in the crypts of Winterfell, in front of Lyanna Stark's tomb. Jon throws Littlefinger against the wall — but why?
Many of us would probably jump at the chance to rough up Littlefinger, but the locale here is the most interesting part. Is Littlefinger revealing information about Lyanna to Jon? Will Jon find out that Lyanna is his real mother, and somehow get upset with Littlefinger in the process?