For some reason, Disney decided to release the first synopsis of the upcoming Spider-Man: Far From Home on their Russian press site (honestly, looking at this website, something seems off, or maybe it's just Russian). The site is completely in Russian so here is the translated text (the original Cryllic is at the bottom of the article):

Peter Parker and his friends go on summer holidays to Europe. However, the friends will hardly be able to rest — Peter will have to agree to help Nick Fury uncover the mystery of creatures that cause natural disasters and destruction throughout the continent.

One thing that's certain is that the stakes are high here, Peter isn't facing some Joe Shmoe villain but rather "creatures that cause natural disasters and destruction throughout the continent."

The actual trailer for the movie was debuted over the weekend at Brazil Comic Con in a closed event where some of the lucky few leaked the information out to the rest of us. As HypeBest reports: 

The sequel will largely focus around the threat of Elementals, creatures composed of sand, water, and fire. The group of four typically includes Hydron (Lord of Waters), Magnum (Master of the Earth), Hellfire (Wielder of Flame) and Zephyr (Mistress of The Winds), and they’ll be responsible for the natural disasters in Europe. To defeat them, Spider-Man will team up with Mysterio.

Here is the original Cryllic:

Питер Паркер вместе с друзьями отправляется на летние каникулы в Европу. Однако отдохнуть приятелям вряд ли удастся -  Питеру придется согласиться помочь Нику Фьюри  раскрыть тайну существ, вызывающих стихийные бедствия и разрушения по всему континенту.