I'm thinkin' if they do release a Kakizaki 1A, it'll be limited release...and then based on that, who knows. Stickers alone don't mean they'll release one (I seem to remember some Kakizaki stickers for the 1/60), but I'd definitely pick one up if they made it. If they can release a cannon fodder, they can release a dead guy who's not Roy.
I've noticed a lot more people who are excited about this in the GBP thread than have said "I'll wait for the 1/48." Some folks will wait, some folks will get both. Some folks are happy with the 1/60. I'm sure it won't break Yamato if they're 1/60 doesn't sell well, and I'm sure they would pick up on the fact that some folks are holding out for a 1/48 version.
For the record, I'd be all over 1/48 Macross Plus and/or Macross Zero Valks, but it may just be a pipe dream.
Like the 1/60, I think 1/48 VF-1D, VT-1, and VE-1 would be towards the end of the list to get made...but I don't think you're going to get any definite answers here. I think the enthusiasm for the 1/48 is undeniable and I think it is possible, if not 100% likely. I'd bet good money we'll see Max/Millia VF-1Js though.