I've checked a few words and it seems to be mostly the same - although it's laid out slightly differently - obviously it's accessing different versions of the dictionary.
The box is bigger I think, so there seems to be slightly more room and therefore more of the definition in the box (I'm comparing my PW with my KTouch) but where it doesn't all fit in the box even on the PW, you still have to hit 'show full definition' and then it goes to the dictionary.
I think it might have been more accurate for them to say 'you'll get the full definition in the definition window more often, but some definitions will still be too long and you'll have to go the dictionary to see those'. But I suppose that doesn't sound as good.

Maybe they only tested it on the more simple words...