Heroes of the Storm is getting a brand new battleground very soon in the “next big patch” (which is also said to see the introduction of Tychus and Gazlowe reworks).
It’s called the Lost Cavern, and it eliminates map objectives to focus in on a single-lane arena situation. You cannot heal at the starting area anymore — in essence, this is the ARAM gametype you see in other MOBAs, without the “random pick” element.
There’s several caveats though, as it will only be available in custom games at the moment, and it looks like a re-imagining of Tomb of the Spider Queen, aesthetically. There’s no timeline for a full release.
Check out a full layout of the map as well as some screenshots below.