Wow, I'm surprised people are questioning so hard as to what this is. To sum it up, much like when Pokemon Chronicles first popped up(Then later ended), Pokemon Origins is definitely a gauge of interest on whether or not to make this into a full anime. Pokemon Chronicles ended up failing, due to people missing Pikachu or whatever(According to threads during the broadcasting period). So yeah, it's really up to Japan's viewers, unless they do decide to dub this, then it's also our call.
Anyway, I love that they're trying something new revolving characters I'm so familiar with, just disappointed they're not the manga versions. And from the looks of those pics, it doesn't seem like they're using the opportunity to introduce Blue(Green), which is a shame considering how much GameFreak wanted to include her in the games back in the day. Regardless though, I'll be looking for subs or vice versa during the premiere.