Unless you bought Rapture, Dim Pro or the Z3ta's as separate synths, I don't see BandLab including them. I would expect Rapture Pro to be on sale, soon, probably one of the first "pay to add to CbB" products for BandLab. How is BandLab supposed to make money if they give away synths that take sales from their premium synths? However, if you bought those synths originally you can, of course, use your DVDs to load them.
I also don't think there is a lot of money floating around for VSTs - Wave is selling plugs and collections for pennies on the old dollar amounts. That sets a bottom to the market. However, Cake's SSL buss comp is as good as any soft comp I've used and BandLab could sell the whole SSL channel (the rest of the items in their chain are good, too!) as a collection. The 1176, La2a clone and EQ are all good and I could see BandLab releasing those in Waves' $29 range or collections for $50.
It doesn't matter how much BandLab paid for SONAR - they can't pay for it by giving it away (cue the old joke about losing money on your product but making up for that w/ quantity). However, you can ameliorate the costs by selling older products polished up (since PC modules are sized VSTs, it shouldn't take much to make them bigger etc.). There is a modest market for those and the synths, esp. if they have a largish market share with their free DAW. I appreciate what BandLab is doing but I don't want them to go broke by giving away the store.