My guess is that it may be just a tad bit smaller than iPhone 11/XR. Not by much but a little bit.
The iPhone 11 dimensions are 150.9mm x 75.7mm. So it’s closer to the iPhone 11 Pro than the 11.
The iPhone 11 Pro official dimensions are 144.0mm x 71.4mm. The 6.1-inch iPhone's CAD dimensions are 146.7mm x 71.5mm. So yes, it’s just slightly bigger.
And the new flat curve design may also help cut the bezels.I see. If this is the case then the bezels around the phone would have to be quite a bit smaller than on the iPhone 11 Pro and most certainly the iPhone 11. I’m good with this.