I was just on a french popular game website, having a look to buy a new pack with the sales. I searched for "the sims4" and ranked the result from latest to oldest, and the first option was The Sims 5...
No. From what's been stated, there's still a ways to go with Sims4. But we will just have to see. Unless or until we get any kind of an 'official' word, I'm just going to take this as pure speculation.