This is, IIRC, the first time (EDIT: Since V Collection 4) they've released a synth without simultaneously releasing a new V Collection. So my statement that they've "historically" just added new stuff to the current collection is a bit "simplified" I guess.
I only JUST did the upgrade from V6 to V8 since they finally offered me the 100usd deal, putting each instrument at about 13 or 14 bucks each. Brand new customers get it for around 22 or 23usd per instrument. Version to version upgrades are generally around 25 to 26usd per instrument.
Upgrading every 2 to 3 version seems to be the way to go. I first got V4, then V6, and now V8. Given that they just gave me the good deal, I fully expect V Collection 9 to come out soon. However, V8 is still only around a year old, and the version upgrades seem to come about every 2 years.
I guess we'll see. But it sure is frustrating.
EDIT: Note that I'm not counting Pigments because that is not an emulation, but an entirely original product. That's fair.