The split is quite high. I honestly can't think I've seen anyone wearing a dress split like that in any office I've worked in - possibly ok on back room staff who aren't client facing.
If you're sitting down at a meeting it's going to show a lot of leg. If you're standing up at a networking event, it will be ok.
And before you or anyone else starts on the "pearl clutching" "what's wrong with legs" road, it's got nothing to do with "pearl clutching" and everything to do with what women in my sector, and the other professional sectors I interact with, wear. But of course you're the best judge of what would be ok in yours.
New Look itself describes it as
A must-have pick for date night and drinks with the girls, style it up with a heeled boot and clutch bag for a touch of evening glamour.