I think the three main ones will probably happen, even if one ends up being a store exclusive... and I fear it is more than likely, because the Voyager size class is usually the slowest to sell. (when it was announced that POTP Starscream was a Voyager, I knew that it was really unlikely that we'd see it redecoed into Skywarp and Thundercracker)

If WFC Starscream was a Deluxe mould, we would see the three main seekers in the first 2-3 waves, and at least 2 more before the end of the regular line, and 1 or 2 other ring-ins like Acidstorm and Sunstorm as store exclusives.