It would be neat for a Pokémon anime series to be more intended for older audiences. Like sure, the anime we have now is good, but if they made something made for like, the original players from when it first came out that was a little more mature, I could see that being popular.
If it does last longer than one episode it will probably turn out to be like Chronicles and not last and just have a few episodes. Not be really long like the current anime. Which in retrospect will be good because for some things the longer it is the more repetitive/dragged out it can get (current Pokemon anime).
I dunno, Chronicles was a spin-off about a bunch of side-stories for a bunch of side-characters, it really wasn't meant to last. This has a story to follow much like a new anime, and I wouldn't mind a new 24-52 episode Pokemon anime for a different audience.
I'm fine with a one-off as well, though. I'd rather they make it for what it is rather than they milk it for all it is.
When I saw the trailer, I thought his meeting Lance was a sort of "precursor to a journey" type deal. Y'know, as in Red made contact with him in his early days and decided that he would dedicate himself to defeating the Elite Four, and ultimately, Lance.