This video might give you some idea about what we want to achieve with AI. We want AI to work more with it´s environment as well and good example of this might be rappeling.

It Is very old media

It is old, but still represents what kind of AI you can expect from us.
No major changes here.

But what about aliens?

We have shown some of them in said video. We do not plan to show every single alien like this though and some will remain a mystery until you actually play the game. But that being said, you will see some more aliens in the future for sure, in gameplay videos. But in the mean time, this is where I get off.... We will talk about this later

Will the AI be unique to the old counterparts or will it be a new slightly advanced AI?

I don't fully understand your question. We're constantly working to make our AI better where necessary. It's a process of getting each part working well, rather than scrapping everything and trying it all again (unless absolutely necessary, of course).