Might be an upgrade if you're using devices through Ikea's hub, but if you've been buying Ikea's zigbee devices for use with some other zigbee network it's a bummer that you won't be able to get them anymore.

Even if you're all in Ikea's ecosystem it will still mean whatever new devices you add from now on are a separate mesh network and can't use the existing zigbee products as repeaters. If the next thing you want to add is at the far end of your house from the hub, it won't have reception there with Matter until you put other new devices in between.