So, I've never read X-23 comics, but what I remember of the character from covers and whatnot is that she was in her late teens when she debuted. Which makes me wonder... how is a pre-teen (in this movie), who's apparently had the adamantium treatment, EVER supposed to grow up?
Think about it... adamantium... the toughest element known to the Marvel Universe... which is locked in position around her bones... will never change shape (i.e. 'grow')... and she's therefore gonna be stuck at whatever size she was when given the adamantium treatment.
Is the work-around that her superpowers include an adamantium excreting gland that, during some sort of growth-spurt hot-flash (literally hot enough to melt adamantium <-- to make it ductile) which allows her to 'grow' in chunks as her rapid healing power augments and restructures her skeletal and muscular system, coats her newly reformed and lengthened bones in a fresh layer of adamantium?
Or has Wolverine simply had a child with a daughter of Magneto and X-23 can use her powers of magnetism to 'stretch' her adamantium subconsciously as she grows?
If they really want to show off her toe-claws, they should have her do a simple straight kick to someone's face and have the claw jut out through the back of the kickee's head. We'll have to see it on the big screen to know if they gave her the toe claws, I don't see them in those previews.