You would need to have 802.11ac capable wireless transceivers in your laptop, tablet, etc. to see any improvement with a 802.11ac router.
The devices that are hard wired in will not see any improvement either since this just impacts wireless. The only difference the hard wired devices could see is if your old router had 100mb wired connections and the new one had gigabit. However you might already have gigabit wired ports in your router.