Some videos have just started surfacing showing the gameplay of Sims Mobile which is currently in soft launch in a couple of smaller countries (sorry USA!). Here's the best footage I've found of it so far.
To me it looks like Sims 4 mixed with the Life Dreams content from Sims Freeplay. I think it looks pretty good! Of course being a free to play game it has micro-transactions, but I don't mind those too much as long as I have plenty to do in the game still.