Spoilers!

Spoilers via E! Online:

ThomasJones: Any scenes coming up for Damon and Elena? Stefan and Elena? Any movement on the love-triangle front?
According to a very solid source, the Damon-Elena-Stefan love triangle will “blow wide open” when the show returns for its spring run with the “Heart of Darkness” episode. (Yee!) So, Delena and Stelena fans, prepare yoselves for battle! And don’t forget: TVD boss Julie Plec teased to us more kissing (for all the characters) in the final episodes than all the previous episodes this season combined.

Molly: What can we expect from Tyler’s return? What does it mean for Caroline and Klaus?
Tyler makes his return in “Heart of Darkness” with a big sexy scene between him and Caroline. Hope Klaus doesn’t find out! No, really. You know how Tyler is all sired to him and everything? That would not end well.