Wow, I an a little late in this thread, and I wish I could say I was surprised - I am instead a little relieved. The long silence and suspense from SMS was killing me.
In spite of how it was marketed, Poser 11 always had a single version. Debut and Pro versions are just a matter of locking/unlocking features with different serial numbers, but it's still the same program. It's just a marketing strategy to justify selling the SAME program for higher or lower prices. Having that said, whether Rendo claims to have acquired "Poser 11" or "Poser 11 Pro", it's the same thing software-wise. In practice, if you have Poser 11, you already have Poser 11 Pro with some features disabled or not visible in the interface. Like Glitterati3D has said above, an "upgrade" from Standard to Pro wouldn't even require a download of anything - you already have the Pro version. The new serial number will unlock the missing features, and that's all.
Like some others here, I have seen Poser being passed ownership from one company to the next so many times that it becomes hard to keep track of it. Poser has advanced quite a bit with SMS, but some decisions they made were less than stellar, starting with Poser 11 Pro being overpriced, the Standard version not being able to copy morphs, and the insistence of adding new flashy features instead of fixing the things that were broken. We ended up with lots of new features built over the same-old bugs that were being perpetuated to the next versions. That makes sense, SMS being a software retailer. They have prioritized the marketing value (shiny new features) over quality (fixing the old bugs). I can only hope this will be different with Rendo, because they understand this market and know who their public is - as opposed to how it was with SMS. The fact that Rendo has lowered the price is an indication that they indeed know who we are. That is a relief.
Honestly, I don't care so much for a version 12 as much as I care for having the rather SERIOUS issues that have plagued Poser for decades. Perhaps the major one being its inability to support Unimesh geometry internally, which results into breaking all geometry exported from Poser. As a consequence, morph targets we export from Poser cannot be used anywhere, because the vertex count is different from the original from the Geometries folder. This was also the reason why Reallusion has failed to support Poser exports - the exported geometry is incompatible with the original. This has a series of bad consequences in content creation, like Poser's built-in Morphing Brush being incompatible with non-Unimesh geometry, which causes the "Smoothing" brush to spike out the model when correcting JCMs. Lady Little Fox has written a whole page of such things to justify why she had abandoned Poser content creation, because those things can indeed break your workflow. I know she's right because it has happened to me, too.
Nonetheless, I have discussed this with Larry Weinberg, the guy who has originally created Poser, and he said they would have to rewrite Poser from scratch, because that's how the core of the program was designed to work, where changing that would affect (break) everything else. I have shown him my broken models, and he understood how serious the situation was for content creators. When Poser 11 SR-5 was released, he made an effort to at least make it possible to fix JCMs using the Morphing Tool by adding a "workaround". It was not a fix, but a way to make that part of the process possible without destroying my models. I remember being stuck for months until Larry and his team gave me a partial solution back in 2016. He said this could be fixed in Poser 12, but he didn't make any promises. I understood a change of that magnitude may not be allowed by SMS, who was more concerned with adding new shiny features that look good on marketing ads.
We have yet to see if Rendo will fix things, or just add new features on top of the old broken shell. In good part, I believe Poser has been losing content creators because of this, plus the mainstream figure wars between bickering companies. Attracting more content creators to the Poser side means getting it fixed, which according to the guy who created it, would require re-writing the code from scratch. Would Rendo be willing to do it?