I guess all of the contracts of the 6 man of EG has expired and EG has seen that they need to change their way to see some new changes of their Dota 2 team.
Good choice though as these SA players have shown that they've got what it takes to put their performances in the next level. I'm sure that they'll improve a lot having this huge org on their back.
South American teams did quite well last season and in TI so maybe EG has thought that would be better if they hire SA players to be on their roster.
We will be missing Arteezy though in EG. He has been in EG for quite some time now. Hope he finds a good team to join next DPC season. There are lots of team changing their roster, so maybe one of them will pick up Arteezy
As for our boy Artour, he'll surely find a new team as he's still one of the most desirable carries that they've got. If he's going to stay in NA, he should also have those teammates that has been experienced for them to reach the next TI.