New Power Rangers Dino SuperCharge Promo
 

some interesting story details here...

https://www.youtube.com/watch?v=x4DKxN0ybMI

Dark Energem eh? Potential Talon Ranger?

I think that's a near-given at this point, especially since Spino Zord/Spino Charge Megazord shows up late in the season.

Bigger question is, who will it be?

Running bets/rumors are Heckyl/Snide.

I do think you're right, Especially since the Dark Energem was responsible for Snide's creation so since Heckyl had it first (Which led to Snide) he may be bonded to it and thus could be the Talon Ranger

When was this established? *raises eyebrow in shock/curiosity*

Here: http://powerrangers.wikia.com/wiki/Heckyl

(Excerpt from Heckyl's page on RangerWiki copied down below, Spoiler Warning obviously)

Heckyl's backstory

Millions of years ago, when Lord Arcanon assaulted a kind-hearted Heckyl's homeworld, Sentai 6, to gain the Dark Energem, Heckyl tried to protect it from getting into the hands of evil. While he was on the run from Arcanon, he fell and the Dark Energem went off its containment box. An injured Heckyl tried to get hold of it, but when he touched it, he started getting surrounded by dark energy, bonding with it, and became evil and also developed a monstrous alter-ego named Snide. Arcanon arrived and retrieved the Energem and said that he won't remember any of this incident or his past.

I see on the page that there's screenshots. When did that episode air? Or has it yet to in America?

It hasn't aired yet in the US, which has happened the last couple of years, the rest of the season aired way ahead of us in other countries, while we suffered those stupid-ass summer hiatuses.

That's what I figured. Because I've all but like one or two of all of the PRDC/PRDSC episodes. And I always managed to find out what happened in them.