Pokémon GO just rolled out a new Weekly Challenges feature that lets you team up with up to three other players to complete tasks and earn rewards. Inspired by Party Play, this update adds a fresh cooperative twist to your weekly grind, encouraging more teamwork in the game. Whether you’re in it for the XP, items or just the fun of finishing challenges with friends, it’s a good time to squad up and get moving. The feature is live now, so grab your crew and start knocking out those goals together.
Source: Official Pokémon GO blog
Pokémon Blog 
as of a sudden it is disabled again… just says I should come back next week
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Later I got some results screen, and now only the old team play is visible
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