Pre patch v2.1.1:
The Phoenix set does not currently work on the PTS.
It states in the tooltip that:
When the effect ends, you heal yourself and explode for 5128 Flame Damage to nearby enemies.
However, the set does not work as intended. Instead it explodes for the damage while you are still locked in statue form and then keeps you locked until the selfheal (which either does not come or is negated by the fact that you can be killed in the waiting for it, while your skills are locked).
I have done multiple tests that keep giving the same conclusion, marvelous screech of a phoenix, followed by a cool explosion, followed by immediate death..
Here is a video of one of my tests (if you look at my health, you can see that I receive no 5k heal as stated in the tooltip):
https://www.youtube.com/watch?v=akPTbwmdnQ8
Another video example (here I actually receive the healing, but same result..):
https://www.youtube.com/watch?v=cqjpLmsMX4E
Further, I think the new Tel Var sets are quite lackluster, take the Phoenix set for example, it explodes for 5k damage and heals 5k (well is intended to anyway), 5k damage which in pvp = 2.5k because of battle spirit damage nerf. This set would be much greater if it healed and exploded for 15000 damage, because then it would actually be a worthwhile set to use in both PvP and PvE.
Currently The Phoenix is just a broken set that, if you seek an equivalent effect, is outdone by the Yokeda set, both normal and Eternal, since these sets do not keep you from using your skills when the effect is supposed to end and will actually give you a second chance in a fight.
After patch v2.1.1:
Did a few more tests, all three resulted in the heal happening at the correct time without locking you down and one actually shows it healing more than it should be able to, which means healing increased buffs will increase the heal. Another video shows the explosion critting. It's still a super weak heal and damage in my opinion, having it at at least 10 or 15k damage / heal would make it actually useful, the 5k heal will not save you in most situations, certainly not against players. It should be something to watch out for, I mean it looks and sounds majestic but it is the equivalent of getting slapped with a wet noodle.
Explodes and heals as intended (4.7k heal, 4.6k explosion):
https://www.youtube.com/watch?v=oaCqiu7Ndck
Explodes and heals, even if I say it doesn't in the video I just couldn't see it because the damage overlayed it (it does 4.7k heal, 6.9k crit explosion):
https://www.youtube.com/watch?v=-ElyoBnnSLk
Here's the video where the healing is a lot higher, possibly because of the coagulating blood buff, which I think is not intended to increase it and certainly not by that much (9k heal, 4.9k crit explosion):
https://www.youtube.com/watch?v=lWz79B316jM
"Madness is a bitter mercy, perhaps, but a mercy nonetheless."
Fire and Ice