So far it looks like Heliolisk and Helioptile are going to know a new move in PvP called Parabolic Charge, which costs 55 energy and does an underwhelming amount of damage (some sources say 25 and others 65). Heliolisk also will know Thunderbolt which does 90 for 55 energy, so it looks like Parabolic Charge will be useless.
That is, unless Niantic makes it do what it does in the main series, which is restore the user’s HP by half the damage dealt to the opponent. This mechanic would be a first for Pokémon GO, but would be especially beneficial to Heliolisk since it’s a low HP glass cannon. In particular it’d be an excellent move to use against high-STA, low-DEF tanks, particularly those weak to Electric like Drifblim, Lapras and Walrein.
That would be a fairly daring move for Niantic, but it’d certainly make things more interesting if they introduced a new mechanic. It’s likely they would nerf it though (maybe it would heal 20% of the damage dealt instead of half). Do you think we’ll end up seeing this?
Given how little damage it deals, it’s gotta have a stat-altering mechanic or something. At the very least they cop-out on introducing new mechanics and just make it buff your DEF stat. If it does steal HP, then it might even need an energy discount since it has to land un-shielded (which would also make it in an awkward place since stealing HP is only useful if there’s more fight left, not in closing). Half of 25 damage isn’t much and basically means you survive one or two more fastmoves. That’s basically the overall equivalent of dealing 50 damage. 
So they probably need to buff it to make it usable.
Imagine having a similar role to Megas but boosting the HP of all attackers in the lobby. Now Blissey (and whatever other healer 'mon) have a role in raids, boosting everybody else’s glass-cannons. Might give something for the lower level players to do to help out more since they lack the top-tier DPS options older players have. 