It can't be that long to wait now and the comparison is one that a lot of us are interested in as the 760D looks like quite an upgrade. I pondered this earlier this year but as I found a reasonable deal on a 70D I traded my 550D in for it. I can promise you there is a great deal of difference. One of my favourite posts here was when someone said "it's a lot more camera" and it is. You have much more control, certainly over the 550D, as well as the extra focus points, touch screen and lens micro adjust. The 760D may close this gap or even surpass it so I would just hang on and check the reviews and comparisons since it's so close. The sensor is likely to be the main point of interest, the 70D doesn't of itself give higher quality images just because it has a few extra megapixels but the quality and flexibility of the camera tends to lead you in that direction.