I've been meaning to post in here awhile but kept on forgetting or didn't have time. But now I have a few free seconds I'll give a few quick opinions:
But first of all who exactly posted this and what do they do for the show? Is it a writer? Animator? Voice actor? What this person does holds an importent impact on how the information can be looked at.
The Gal Pal:
So from what is said Ash's female companion for this series doesn't look like the 5th Generation girl but doesn't look like Dawn. All we are told is that she is an "original" child and she has a hair styIe that is "cute". Now ignoring the hair styIe for a second, let's focus on what they mean by "original child".
I've read a lot of different meanings for what they mean by "original" child. Some say it means the character is an only child, other says it's relating to Misty as she was the "original" female companion. Now right now I want to debunk the Misty thing. If it was Misty, the blogger would have said it was an "original character", not an "original child". In addition I doubt anyone wouldn't be able to recognize Misty, even is she's wearing a new outfit, her hair would be a big giveaway. So it could very well be a new character, or maybe it's just Dawn in a new outfit. Why do I bring Dawn into this? Well Dawn has only been with Ash for Sinnoh, May has been with Ash for atleast Hoenn and the Battle Frontier and being they are skipping the Generation IV Battle Frontier it just seems like Dawn should be on for maybe at least 1 more season or whatever they call it in Japan. So I'm saying it's either a new character entirely or it's Dawn.
Brock Dropped Like A Rock:
So three episodes in and there is no sign of Brock. Now is this really a surprise? Hm, not really, as in Hoenn is took Brock 4 episodes to fully appear while in Sinnoh it only took him 2. So for all we know Brock could be appearing again, after Sinnoh he probably went to check up on his family and depending on what happened (and he has to fix) it could delay his trip to meet back up with Ash. I'll also like to point out that the blog doesn't mention Ash's boy companion, just the girl, so it could be possible Brock got a little hung up at home.
Of course for awhile it has been said that instead of the girl being replaced each Generation, why not replace the boy with the playable boy character from the game? This was brought up to a writer who was doing an interview and agreed with it and said they he'll bring it up with the writers to consider. With that said it could be possiblt Brock isn't coming back, thus the long absence of the boy companion, and they want to introduce the playable boy character of Generation V is an episode where it can be completely focused on him as usually for the first few episodes of a new region there is a crisis Ash and Pikachu go through (usually caused by Team Rocket).
However Brock doesn't have a reason to suddenly vanish. He handed the Gym over to Forrest so no need for him there (besides the visit after Sinnoh to fix any problems) and the best way for Brock to become a greta breeder is to actually travel around. So while I'm not against Brock not being with Ash for this season, they better give Brock a good reason to if he is indeed not Ash's boy companion.
All These Rivals Look The Same:
So the new rival looks a bit like Paul. So is it possible that the character is Paul and he's just dressed differently or is it a new character. Personally I like Paul as Ash's rival, he's the opposite of Ash and knows just how to push Ash's buttons, something which a rival is expected to do (though Gary is still Ash's best rival, Gary's attitude just makes him better and a bit more dimensional then Paul).
From what I can see, we need more information though much like with all Generation V info we're only being told what the Pokemon Company wants us to know for now, proved by the fact this blog post has been taken down. Also unless I know who said this I can't really get an accurate idea of how they are seeing things as. Overall Isshu sounds to be shaking things up quite a bit.