As I understand it, it's basically €199 unless you've already *renewed* a *yearly* subscription to Platinum this year, i.e. initially purchased a year's membership in 2015 (or, possibly, paid a full year of monthly updates, I don't know if that also counts) and renewed for a full year in 2016. Staying current with monthly payments does not count, as you haven't prepaid for any time. Again, that's just my understanding of the situation, not an official statement.
Those of us in that situation, and were signed up for emails (and it is known that the email system is or at least has been in the past, somewhat flakey) were given an offer to buy into the lifetime option discounted, essentially, by the amount we've already paid this year. If you're in that situation but didn't get an email, you can try to catch the ear of one of the CW staff that poke their heads in here from time to time (maybe PM one of them?) and they should get you sorted if in fact your situation qualifies.