In the comic books, Kamala Khan's powers are activated when the Terrigen Mists are unleashed on Earth and she's revealed as one of many of the planet's dormant Inhumans. Gaining what have since been dubbed "embiggening" powers, the young girl names herself Ms. Marvel in tribute to her own personal hero, Captain Marvel. Unfortunately, not all of that origin will work in the MCU.
For starters, Inhumans don't currently exist in the MCU, and we've already heard rumblings that Kamala's powers will come from the Kree Nega-Bands used by the original Mar-Vell in the comics. This would also goes some way towards explaining why she'll play a role in The Marvels, and a leaked image of the hero (see below) indicated that her powers could be portrayed in a vastly different way in Ms. Marvel.
Now, that may have been confirmed in a rumour shared by "scooper," Daniel Richtman.
"Ms. Marvel will still have her embiggening powers but it'd look more like...Green Lantern, less Mr. Fantastic," he claims. This does make sense, as it should avoid any confusion with Reed Richards when he shows up, though it's hard to escape the feeling we're missing out on something special here. The Avengers video game wasn't that memorable, but seeing Kamala in action was really cool, and a visual that arguably can't be replicated by energy fields.
It's inevitable this will upset some fans, but without seeing Ms. Marvel in action, we can't really judge whether this will improve on the source material or ultimately do it a disservice. This also essentially means that Kamala will use tech to be a superhero and won't have superpowers beyond that.
Only time will tell whether this works. Marvel Studios certainly hasn't steered us wrong in the past, but it wouldn't be a bad thing for Kevin Feige and company to hurry up and introduce Inhumans, already!