I don't know, while I really like the PST 2 esp. at some of the sale prices in the $700 range or less we've seen the last couple years, I'd be a bit nervous of what a PST 3 would be price/performance wise. Optically at least in the couple of samples I've had for example the PST 2 is better than the Strike Eagle, and the MSRP's between them are quite different ($900 vs $1400), yet they have had very similar street prices in the last couple years because the discounts on the PST 2 are so much more than the SE. However, the SE has a nicer feature set. Now if you are looking at $600 for a SE and $1100 for a PST 2, the pricing certainly justifies the optical performance gap.
It also seems like vortex has been either increasing prices, or enforcing prices more lately. You don't seen tons of stores offering PS2's in the $700-800 range anymore, most are now all listing the MRAD version at $1099. Vortex must have brought the pricing hammer down because pretty much every store that used to offer them well under $1000, is locked into $1099. $1100 is close to Burris XTR-III $, and considering recent reviews optically put scopes like the Bushnell Match Pro ED better than the PST 2, but at prices that can be found under $600, the market in the say $600-$1000 street price scopes is getting very complex. That said trusting reports is hard, so many sponsored shooters are in forums either playing down competitors optics, or up their own brand. Just about every year a new scope comes out that we hear is performing with scopes 2x it's price, but then a year or two later, the reports become much more lackluster. We also know optic companies are pressuring even forums like SH to not report on scope performance. Lowlight has stated that they no longer report tracking results for scopes because some manufacturers raised a fuss about it.
That said I'd love to see a say 30x top mag option PST 3 with more elevation and built a bit heavier duty, but still keeping the street price close to $1200 or less, but if it pushes anywhere near $1500 its hard not to go other directions.