There's promising and there's being good enough to be title contenders.
I've looked at their squad and it's made of up decent/good with one or two excellent players. Their biggest asset by far is their manager.
This is not new, you see this every year - usually with Tottenham, occasionally with the likes of Aston Villa and Newcastle. Everton will have a good season and finish 5th or something - possibly giving the fourth place team a scare if they're not too careful.