Short answer is that all screens are designed to reproduce adobe RGB colour space. They can all do this, and properly calibrated many can do it very well. If the display is capable of producing colours widely outside of this gamut (which is largely pointless as no digital images will be able to utilize it but for some extremely special cases in design) you might get a washy looking crazy 'extra' intense image.. the kind of image that screams "I was never calibrated". But it largely doesn't matter. Many reviews of a display will list the colour space it is capable of reproducing but the specs on a display (all of them generally) are so out of proportion with reality that they are useless.
Oh, and of course there is the fact that anything capable of producing the wide gamut RGB will cost a bloody fortune.