In Chapter 7 of The Hobbit, what two pieces of information does Beorn gather at night in his bear form?

Beorn chiefly chooses to leave the company to discern the truth of their tale, which he manages to do by discovering the burnt wolf-glade and had actually managed to catch a Warg and a goblin wandering in the woods. From these prisoners he finds out that the goblins and Wargs were still hunting the dwarves and that they were fiercely angry because of the death of the Great Goblin and the deaths of other Goblins and Wargs. Yet he also finds something else out:

So much they told him when he forced them, but he guessed there was more wickedness than this afoot, and that a great raid of the whole goblin army with their wolf-allies into the lands shadowed by the mountains might soon be made to find the dwarves, or to take vengeance on the men and creatures that lived there, and who they thought must be sheltering them.

Beorn thus establishes the veracity of their tale but also discerns that the Goblins and Wargs are planning an attack that culminates in the Battle of the Five Armies at the end of the novel.