Update:
We went ahead this weekend and enjoyed a soft swap. All I can say is was a great experience for all involved. The girls started things off kissing and stroking each other, teasing us men. After they were nice and excited from each other they involved us by first giving oral to their respective men, then switching. It was really hot seeing my wife give oral to another man while receiving oral from a new woman at the same time. It was even more hot seeing her receive oral and a fantastic orgasm from two new people.
I think the best part, for me anyways, was the the end where the other male was fucking his girl from behind while she gave me head and my wife rode my my face. Just so many bodies touching each other....damn. She also did something I can only describe as the hottest thing she's done to me, right before she was going to have her last orgasm on my face she took my cock out of the other women's mouth, kissed her deeply with tongue, and jumped on my cock until she finished.
Long story short, we had a GREAT time.
On a side note we've had sex at least 5 times since Saturday night. That's a happy perk lol. She also seems want more affection from me these last few days, short kisses, lingering touches as she walks by, we always cuddle as we fall asleep but it seems she's been holding me tighter than usually too.
While at this point I'm still not ready for a full swap I'm certainly looking forward to the next time we meet this couple for more play.