The selection isn't restricted. Limited Time Hime are not included, but all other previous Hime are. However, there are two unknown factors:
1. DMM Miracle Tickets didn't include SSR Hime from the past few weeks. So far, Nutaku has included those too, but this can change.
2. We don't know the exact release date of the next Miracle Ticket. So far, Nutaku has been followed DMM schedule roughly, but this can change.
We can fairly certainly say that Mammon and all (non-Limited Hime) before Mammon will be in the next Miracle Ticket. But how many more? 1? 2? 4? 5? Five would be all you need for Chemobog for example. Time will tell, as such, I'd rather not speculate on the correct option until we actually know what the options are.