I think cats do communicate to eachother telepathically. Whether they do this with humans I'm not sure, but I think it could be possible. Some people have enduring links with their animals, and I think it's wonderful.
Cats communicate with us by meowing, cause apparently they don't meow to eachother, that's for our benefit.
Jack & Sunny definately talk to eachother telepathically, Sunny sleeps in our bedroom most of the time, it's mostly her territory, many a time Jack has jumped on the bed, and Sunny looks straight at him and they stare at eachother, and then Jack slowly looks away, jumps down and walks out and sits outside the door. I am 100% sure she has told him to go away and not come into her territory. Likewise when it comes to sharing food or water in the glass.
Last night Sunny was drinking water out of the glass on the sideboard, Jack jumped up too and was behind her, she looked around, finished drinking and moved forward so he could then have a drink himself, I'm sure he told her to move along because he wanted a drink, they didn't meow, just looked at eachother.
I think perhaps they do try to tell us things when they look deeply into our eyes, and I love it when they look at us and open and close their eyes I've been told this is a sign of love that they're giving us.
I love it when Jack looks at me, doesn't meow and just stares into my eyes and then give me kisses, as if he's saying I really love you and then gives me a headbutt.