Last week SIliconLabs has given a online-lesson in China about Matter. There are some information about Matter.
1, Matter is another type of ZCL, it runs on the WI-FI , LAN or Thread.
2, Differend from ZigBee, Matter Device(Thread-network) join into network will not needs MAC-Associate, It needs BLE(Smart-Phone)to control it and input network-information(SSID,beacon,password)
3,More resource was needed. The Flash-ROM is at lest 1MB and RAM is at lest 128KB. So I think CC2652x7 can support Matter.