My suggestion is to add dates (even if approximate) into the beta news posts to give beta testers a better chance to organize their time and prepare for bigger and smaller testings. The thing is, many people have busy lives and can't really check every day, so adding an approximate date when the next testing should take place would be very helpful.

For example I'll be away for a couple of days in early to mid July and I'm kind of expecting the Kathiawari testing to fall onto these dates... so it would be amazing if we knew when the testing will take place, so we could prepare for it (For me it is the decision of taking my laptop with me or leaving it home).