Yeah... it doesn't seem like they're planning to release a new single by the end of the year. They apparently added new HS dates with the previous single, for Nappi, so that her fans could have a final talk with her before her graduation, and she's leaving early October. Now it's possible that they would have a new single by the end of the year, like released in November, but I'm not really sure that they'll do this, it wouldn't be the first time they have a year with only one release... The fact that their one release was a graduation single though :/ I hope they'll make better decisions from now on, especially when they have so many good girls with 6th gens, they could do something really good with the group! Also yes there are a lot of free spots in senbatsu and there could be more, depending on how long they wait until having a new single lol. I'm like 99% sure that Reia will be in senbatsu in the next single, she's doing well at everything and she even got promoted now so yes, nothing can stop her for getting in senbatsu! Looking forward to it! Hopefully it's soon.