Careers - Pick your dream job and take control of your Sims actions and choices through interactive gameplay on location! Tell the story of the aspiring chef whose catering choices will make or break their career, or take on the role of a Criminal Mastermind and rob a rich residence…will your Sims succeeded or fail? Their fate is in your hands!Note that the careers listed are ordinary careers, not type you see in Ambitions. This means that there is a possibility that workplaces will not only become open in an expansion pack, but will have advanced career-specific goals to achieve, therefore there will be no need for Ultimate Careers. Furthermore, career events and generally better gameplay both in and out of work makes it even more redundant.
At the moment, I don't know what will end up happening. There is still so much we don't already know about The Sims 4. I can only plan based on information I already know - everything else just assumes it will work in a similar way to The Sims 3.
For more information about the survey, I've created a thread on the official forums:
http://forum.thesims3.com/jforum/posts/list/745049.page
For now, I still plan on making other mods for The Sims 4 sometime in the future, assuming it's possible.