I was among the supporters of the idea of everything being in 1/48 scale, but lots of people pissed and moaned that the YF-19 and YF-21 would be too big. Since the VF-0, YF-19, SV-51, and YF-21 are being done in 1/60 scale, with the VF-1s being redone in 1/60, just stick with 1/60. Imagine doing the MKII Monster in 1/48 though! It would be awesome huge!
And, yes, 505thAirborne, the new 1/60 scale VF-1s will be close to the same size as the old 1/60 scale valkyries, because they are in the same scale and they're supposed to be the same valkyrie. So even though the 1/60 VF-1 will be smaller than the VF-0, SV-51, YF-19, and YF-21, those valks are all normally larger than the VF-1 anyway.