Hopefully by June campsites will be open, also public/supermarket/macdonalds toilets. Although Welsh government hasn't confirmed this yet this is what we are expecting and working towards.
If this is the case I'd say crack on with responsible wild camping or a night dosing in your car for a single night. I'm pretty certain government isn't going to make an announcement that covers wild camping.
As a hospitality worker in Wales I would encourage you to book onto an official campsite and use their facilities unless you are really wild camping a long way from the road, and there are no campsites anywhere nearby.
Post edited at 14:21