there's always a chance that the cats will leave the leather couch alone, since the material is a little more resistant to puncture than fabric. Have they clawed up furniture before? I have 2 cats and 2 leather recliners and thus far the only time they come in contact with eath other is for an impromptu nap. I do trim their claws but they're still sharp enough for them to poke holes in the bottom of my shirts when they jump up and beg. Granted mine love their scratching posts and thus far havent clawed on anything else. you may consider putting a scratching post at each corner of the new couch since that's the area they're likely to go for. I have heard that double sided tape deters clawing, but that's probably not good for your leather, and it sure isn't pretty either.

How old are your cats? Like Medusa said, welcome and yes we do love pictures of our members' pets!