I can't think of any actresses taht have bulked up for a role. Created muscle sure, but bulked up? Like the same way that Cavil bulked up? I mean I doubt that Cavil could even wear the same shirt size after his work out routine. It's doubtful that Gadot will go up a dress size or two and then create muscle on top of that. When you look at examples such as Jessica Beil in the Blade sequels and Linda Hamilton for T2 their muscles were very impressive, but by looking at pictures of them before/after those roles I'd hesitate to say that they bulked up, just took what they had and created muscle out of it.
But speaking of Linda Hamilton, based on her body type that might be what we can look forward too. She's still super model slender, just with muscles.
Its not bad but for Wonder Woman? Who knows maybe it will look better in the suit or maybe she will actually bulk up after all.
In either case all any fans of the chracter can do now is hope that Gadot can act, or that the director wants more than a "hot mysterious chick with an accent" for the role. Because "hot mysterious chick with an accent" pretty much sums up the chracter Gadot played in Fast and the Furious.
And just for context this is Jessica Biel.
This is Jessica Biel as she looked in Blade Trinity.
She just has more ..er meat on her bones so it looks more impressive when she does the working out necessary to make her muscles defined.