That's a difficult question, it's natural to see a price drop given increased supply in the form of a suitable supplement, but I'm inclined to believe that Classics UM will command the highest price. I've seen Classics UM sell for $150 prior to the announcement, bought it myself for $80, and currently eBay completed listings still have it for $110 max. The price hierarchy starts with Complete Classics UM, Henkei UM, then Incomplete Classics UM. Seems like completionists are still willing to pay premium price for the perfect fit (for FP City Commander).
As Hasbro HK set Henkei UM with a high RRP (think it was $80?), it's not exactly the dirt cheap alternative. If I was a buyer I'd think, why not pay the extra $20-30 for the perfect fit. Completed FP City Commander is not a highly playable or poseable toy, so the 'effect' of completion is where the money is
Has Henkei UM been released yet? It seems like there's a Chinese seller selling them for $60 a pop, shipped without box.