Sadly, you aren't going to get a revolution in high ISO noise performance in a crop sensor for a very long time... if ever. With current sensor technology there is a limit to how well a crop sensor can handle noise... and with consumers for this category demanding features in video, hdr, etc... there is even less hope for sensor improvement.
But keep dreaming... it never hurts to dream.
There has already been a revolution in crop sensor high ISO noise. It's called the D800. The pixel pitch of it's sensor is VERY close to that of the 7D.
4.88µm v 4.3µm - that's only 13.5% difference. For comparison the 5D Mark III has a pixel pitch of 6.5µm - 50% bigger.
You can't tell me that the D800 doesn't have low high ISO noise. It's very competitive with the 5DIII.
Sure I can. D800 is on par up through ISO 1600 but at that point it really starts to lag the 5DIII. Compare ISO 3200 and 6400 between these 2 cameras and you will notice that the d800 is far noisier. Not only is it noisier it is more difficult noise to clean up.
The D800 noise has colorful red pixels and image resolution degrades dramatically as this noise moves in.
The 5DIII has primarily white noise and retains resolution and detail as noise moves in. This type of noise is very easy to clean up at a very small loss to IQ.
While you will see incremental noise improvement in crop sensors there has certainly not been a revolution. Also, if you were reading through this thread you may have noticed that some folks were asking for ISO 6400 to look like ISO 400 on a t3i. This just isn't going to happen with current sensor tech.
I'm not brand loyal here... the d800 is a big disappointment in regards to high iso noise, especially considering it is full frame. There are too many pixels crammed onto that sensor.