[2019] Any confirmation on the store Planeswalkers?

I know the safe assumption is they won't stick around, but for example will they be removed just as part 5 of the event ends, or be given a grace period? What about when the other half that aren't currently available drop, will the first half be removed? Relatively new, so is there any past event one can make an educated guess from?

I guess this is wishful thinking on my part, but is there any line of communication that could potentially get those questions answered?