Warcraft Arclight Rumble is a summoner / line war game which features Warcraft lore and characters. Saying it's set in the Warcraft universe doesn't sit well with me -- reserved to that which is canon on the Warcraft story. Warcraft Arclight Rumble is a spin-off mobile game as it's Blizzard other attempt to break through mobile gaming. The other would be Diablo: Immortal.

Warcraft Arclight Rumble does not have base building, but players will deploy units (called minis) to overwhelm the opposing summoner. The units look like toys. You're also able to do AOE spells to aid your units from time to time.

If anything, I'm indifferent to Arclight Rumble. It's nice for Blizzard to add another Warcraft game. Arclight Rumble is nothing new per se. While it's truly not a bad idea to introduce a Warcraft game in the mobile arena, I think players are getting antsy for Warcraft 4 which can pave way to WOW 2. Look at Overwatch 2, it's the least Blizzard game to have its second iteration - when it's virtually the same game as the previous one.