It seems to be fixed truth that Lay wouldn't be together with EXO anymore.
As you might be aware of already, Lay recently didn't appear with EXO. In last week, a staff from SM revealed EXO's comeback plan in July and plan about filming music video for comeback in next week. However, in this time, again, Lay is known to be unable to have a activity as an EXO. SM's staff said that Lay is too busy in China now to comeback as an EXO, but it all was discussed with SM beforehand. Despite of all these SM's explanations, Netizens look quite disappointed by Lay's absence. Also, different from what SM has been saying, SM produced lots of EXO's goods for fans which excluded Lay's appearance. There seem only 8 members on all the goods of EXO these days. On these situations, there are lots of controversies.