The lawsuit thing prevented them for adding more content which was already planned, I heard you can even access some stuff(Uber Jason skin) by hacking the game files. But officially there will be no more additional content as of now.
But I meant issues regarding gameplay, bugs, balancing. It got better since the last patch(Jason got buffed). But last week there were some new weird bugs on the cars going on, on the site it says they are still providing continued maintenance and bug fixing.