Wherever you're getting your regular Missions fix should still be active. Local GMs are still running games, there are Mission sign ups at Cons, the Shadowcaster's Network online Missions is running games every month...
Shadowrun Missions is a volunteer effort, everyone has day jobs. And NDRs prevent us from speaking about the tiny bit we do know that the general playerbase doesn't know. Which is actually very little to none, as it turns out for most Missions GMs.
New Missions have been dropping at Origins every year for several years, and the stated goal is to continue that. So you should get a bunch of new Missions in June, and should be a 6th Edition Missions FAQ along with that.
So until your Missions GM hangs up their screen, you're good to go!