Since we're at best in a guessing game until everything gets explained by Cactus in detail - I will toss a guess out and say "no" for the RF60 but "yes" for the RF60X since that flash has an "X". although it will be off-camera TTL since that flash still only has a single pin foot.
It's never too late to change your mind :-)
One more question: Which transceivers will work with TTL? V6, V6ii or will there be a V7?
If you'd bought other flashes that already had TTL then they'd work with this new firmware.The RF60 was only ever sold as a manual, non-TTL flash, and is now discontinued.Cactus are gifting you something by retro-fitting TTL to the V6 II and RF60x flashes (which is functionality they were never sold or advertised with) and you're still unhappy. Other manufacturers would have introduced new products and made you buy something completely new to get the additional functionality. If TTL was going to be such a big deal for you then why invest in a manual system to begin with?
...I decided to go with RF60 because I thought it would probably work best with Cactus transmitters.
... Now Cactus is signalling that I probably shouldn't have bought their own flash but instead should have gone with another brand if I want to stay with the latest features like TTL.
... This just doesn't seem a smart strategy to keep customers who have invested into the Cactus system but it's what it is. I am not whining. I just want to point out that this great new feature may actually cause me to go away from Cactus.