GW2 Ncsoft Trademarks GW2 Heart of Thorns
Guild Wars 2 Heart of Thorns has been trademarked by Ncsoft and will likely be the name of the first ever expansion for GW2.
Reddit user grainnn was able to find the trademark that Ncsoft recently submitted called GW2 Heart of Thorns.
Update: Here is the teaser trailer from end of Season 2 Finale for Heart of Thorns
You can look up the trademark here by doing a trademark search and select world and/or design mark search (structured)