Technically XY and Sun and especially Moon had a pretty good balance between female characters and male characters. This upcoming anime is technically the first one that really favors the boys. Maybe because boys are more into this anime? Not sure what the target demographic of this anime is.
Okay... let's see what we have so far:
This anime is a world tour through the whole Pokémon world.
Ash and Go are the only main characters. Meaning for the first time we will have no fanservice-driven girl traveling with Ash.
This series will have no Gym battles and tournaments?
TR will stay...
Boy, you guys really see in everything a sign of Serena returning. She will not become series regular again. Her time, like with every other companion, is over! I'm actually happy that the anime switches the protagonist with every series to keep things fresh. This anime is about Ash and Go. So...
If there would be a female companion, they would have shown her already. I don't know why they would make such a big deal about her and keep her a secret. I think this will be really the first time we won't see a traditional female lead.
The only things we know so far:
Ash, Pikachu, and TR will return for this series.
Ash will travel the whole world together with Go.
Go wants to capture every Pokémon.
Mew plays a huge role in Go's story.
For the first time, we will have no female companion for this series.
The only nitpick I have so far is how they draw the finger- and toenails of the characters. I hate it, I freaking hate it, when animes do that! A lot of animes draw the nails only half-finished. It looks so stupid. Either they should not draw them or if so, they should finish them. I hate it...
Well... it is not like the female companions or companions in general, really did a lot in the anime. The most active characters were always Ash and TR, which is the reason why the anime never removed them from the series. Plus, I'm not really sure if another female character could really add...
Reboot or not a reboot... this is a good question. I would say it is a semi-reboot, because of all the throwbacks like Oak's lab and Ash throwing his clock at the wall. They will probably bring a lot of iconic scenes back: The Spearow chase, a similar goodbye scene with a Butterfree, first...