Hmm dunno about those three. Sure 4k or hdr would be nice, but i mean it's the content that matters, right? While there maybe a shortage of originals at launch, they seem to have more than enough content to hold over. As for the app, I believe it's just hbonow that will be updated. So you can download that now and wait, or just when it releases just download it as max.
I'm on Roku. The app isn't updating if they don't have a deal in place. Not really sure if they're negotiating wildly right now or doing the typical stall tactics until enough complaints roll in.