Spazzo965 has posted a loading screen of a new brawl that's coming to the Nexus.
New Suns Out Guns Out Bundle
We saw new skins for Stitches, Tracer & Tychus in the latest in-development video. Redditor SerphTheVoltar posted the following screenshot of an upcoming bundle.
The bundle should be out on June 27. (Picture is a courtesy of redditor DavesenDave)
New Summer Loot Chests
Spazzo965 further talks about new Summer Loot Chests that have been added in Malthael's patch. There are Common / Rare / Epic Summer Loot Chests (just like the standard ones) and they have their own sound.
Genji / Malthael Patch added plenty of unused tints for existing Heroes and below is a video of them.