Seriously though, it doesn't seem too far-fetched a claim after seeing all the stuff demoed in the screencast they put out:
Getting pedantic, I suppose there's a distinction between the language in isolation and with its stdlib/environment.
So it's not all that high level. It is compared to Fortran and floats somewhere between R and Octave.
When I make those comments, they are about the language, not the ecosystem or the product as a whole.
The language is merely ok.
The ecosystem, particularly with the amount of data feeds you can plug into it is pretty good as is the sheer enormity of the library of off-the-shelf functions it gives you.
I haven't heard a more amusingly wrong characterization of our language in a long, long time.
My gripe is more that for the multitude of problem domains that you can represent in mathematica, a huge amount can be done off the shelf for the same effort with something a lot cheaper if not entirely free. Very few people need or use the capabilities past the very basics.