Not a news even though it is just happening. The players have been unhappy with him, and everything seems to be falling. Just a few hours ago, the son of Arsenal owner Josh Kroenke addressed the public, and thank Unai for his part in Arsenal. He further wished him for future success.
Emery took over from Arsene Wenger in the summer of 2018, and he started well with 11 straight win run for the team. But everything starts changing from late last season, and the most significant loss was the Europa League final 4-1 defeat to Chelsea. It is not always easy to get a good replacement for team managers. Arsene Wenger coached Arsenal for decades with decent successes.
Arsenal supported Emery with buying of some players to add up to the squad, and this brings about Nicholas Pepe, Kieran Tierney, and David Luiz. All these players joined because they lost the services of two players, Ramsay and Koscielny.
For the time being, Freddie Ljungberg has been promoted to manage Arsenal, while they look for a better alternative. The coach that we may see next could be, Carlo Ancelotti, Mikel Arteta, Mauricio Pochettino, Freddie Ljungberg, Nuno Espirito Santo, and Allegri.
The Arsenal board did the right thing by sacking Emery. Though this could be a little expensive to them based on his contract, but following the continous loss, it is the right decision for business.