Oh how wonderful! Just a few things...
1. Indoor kitties last longer.
2. Kittens are a lot of work. This is not a bad thing, but be prepared for a lot of long, sleepless nights if you bring home a baby!
3. Some cats pee on things if they are upset. Laundry, plastic bags and shoes are common targets, as are any places where another animal or a human may have had an accident. Most cats don't do this but over the years we've had a couple who chose to express their frustration this way (male and female). If you are not prepared to deal with this, you might not want to adopt a cat whose history is unknown.
4. Cats can go where your dogs never did, like onto counters and tables and into small vents. Just be aware of this and kitty-proof accordingly.
I LOVE my cats, and they love me, too. People like to describe cats as standoffish or say they don't care about humans, but it just isn't true. All of my cats have been lovebugs who wanted to spend all their time wherever I was.
I wish you all the best!