How developed is the sex dolls industry do they ...

I don't know about the latest developments (I only know there are silicon dolls which are supposed to be very good), but I'm sure that there are talking dolls. The reason I'm saying it is that I've heard that there were talking vibrators, and it was a few years ago, so I'm sure it can be integrated in a doll.

I heard about the talking vibrator from a friend who went to a stand-up comedy show, and the comedian talked about it. He said it was developed in the US (or something) and that is says things like "oh baby, you're beautiful, you're so sexy" and so on, and that there was a Hebrew-speaking version, that says "I'm so good, I'm driving you crazy"...
One of the people in the audience said he also saw the article in the paper about the talking vibrator.

I was doing some net research about it and apparently, though it does make sense to me that this feature would be very common, it's barely out there. I think that what people like about sex dolls, in a way, is that they don't talk. From a couple of people writing about sex with dolls - the imagination play a big part in this, I think that maybe, most sex dolls users are using their imagination to replace a voice or don't really need it.

There are some info about it here:

http://adulttoyreviews.com/dolls/head.html#talking

A doll with a porn star voice:

http://www.xtoyszone.com/7096xznsxa.htm

Interesting article about sex dolls:

http://dir.salon.com/story/mwt/feature/2005/10/11/real_dolls/index.html 

Ho, and this one doesn't talk but she does post on flickr! 

En Argentina pronto tendremos las sex dolls artísticas. Estéticamente insuperables y hechas con materiales reciclados www.artistdoll.blogspot.com

I find it odd that you would even want this thing to speak.  If it could it might say things like   "get off of me I might pop!"  "is this supposed to be turning me on?"  "Why don't you introduce me to your friends"   "I'll  do that but afterwards can we cuddle?"

I don't know of any that talk to you but you can go to realdoll.com and see what they have