My guess is that it will be similar to price changes in previous build changes.
For example when titles like Godlike Masculinity (which was called a stacking module before) got updatedto Ultima, the price increased immediately as soon as the build changed in the main store. So if you want the lesser price of any particular title before it is updated to ZP, now is the time to purchase them.
But, new titles like Picard QZP will be released with the new price on launch (45 usd) because it comes as QZP.