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...
Doubt it, Sims 4 had an entire year between announcement and release so if it was coming in a year we'd know. (4 was announced at gamescon 2013 in August? and released in September 2014)