IMO this'll help people in two ways, and I think it'll have some impact on the whole class.
First off, it'll help in applying to employers who are less sophisticated, eg small firms outside of OCI and in-house stuff. If you aren't looking for a % rank automatically (see eg job postings requiring at least a 3.5 etc - pretty sure I've seen these, but I may be confusing those w/ my next point), being median with a 3.6 is going to look better than an 87/88 a) because they understand it ( or think they do) as being pretty good and b) because a 3.6 looks "better" on a conventional scale than an 87.5, which most people understand to be a high B or a low B+. I haven't compared the old and new systems in terms of what is and isn't an A+ etc, but if nothing else it's plausible that it could get more of our resumes on employers' desks, and you won't have to do the conversion to a letter scale so it's at least simpler.
Second, it'll help down the road for people lateraling in-house. Again, I haven't conpared the old and new systems, but the grades are curved in our favor (3.6 for median when most places curve to B+, including most T14s) like Northwestern does, and I've seen plenty of job listings asking for experienced attorneys that have numerical grade cutoffs on a 4.0 scale. It a) gets your resume in the door when you have a 3.5 that would have been a 3.1 on most schools' curves, and b) can only help if they don't ask about rank.
Long story short, if nothing else, median WUSTLers have 0.3 GPA points worth of a leg up on Michigan, Illinois and the like, and 0.6 on TTTs that curve to 3.0, which I believe is the case for our in-city "competition."
Plus, I'm pretty sure this makes it easier for me to get my good student discount on my car insurance, which requires either a 3.5 or something or top 20-30 something percentile (and god knows where I'll be in the class after this semester of 3LOL mode), so I'm all for it.