Well, I don't unfortunately have a link to it, though the hug in question is depicted in my icon. *points*
Basically, R'as al Ghul was messing with Tim's head, and Tim was almost tempted to use the Lazarus Pit juice to revive Kon, Steph and his dad. But Dick found him and talked him down from it, and it was all very sad and sweet, culminating in said hug.
It was a very lovely scene, with Dick not pressuring Tim and letting him make up his own mind (knowing/hoping he'd make the right decision), but also being a comforting big brother to Tim.