I don't remember if we've plotted or anything like that, but I know Pavak is joining G2 and that's where Æolyn is. they have elven mage in common so bonding over that is possible, no? Lyn is generally a pretty bubbly personality who can hold her own in any kind of conversation. she grew up outside the social norms of human = good, elf = bad since she was either on the road with her family or with the Dalish. she knows that humans look down on elves, but she never had to go through the persecution other elves went through, so she tends to be a bit more outspoken.
If I remember correctly, Kat is in G1 (?) which means she'll be meeting Roran. she's a tiny human full of spitfire. she takes her job very seriously and wants to be a Grey Warden above all else. she's more of a devout Andrastean than she thinks. she's a nice girl, a bit apprehensive of elves and totally scared of mages. she's just naive about the world and it shows when she opens her mouth.
And that leaves Cormac! Group 3 correct? he won't be meeting Terin till after the visit to Gwaren. Terin will be apprehensive at first. he grew up in the Denerim alienage and has been with the Dalish since the last Blight (after the Siege of Denerim he ran off and found them~), so he's not very trusting of humans, but I don't see him having any problems with Cormac other than that...