First of all, yay for new Mids! Thanks so much for all the hard work that was put into this
Second of all, I haven't seen anything about this on the forums, but I think there's some prerequisite bugs, at least going by the skill descriptions, in some of the epic/patron pools. I'll break this down by pool as I've tested.
Some of the newly added powers to the epic/patron pools are not counting as prerequisites towards the level 47 power of the set. I was originally writing up all the combos that do work and all the combos that don't, but I found the repeating information to be rather superfluous. It's suffice to say that any 2 power combination that includes the prerequisite power that is not counting will
not open up the level 47 power. All other power combinations do, as do any 2 powers that do work + the broken prereq, presumably because they're properly flagged and the bugged power is not. I'll also list whether or not I was able to test whether it's working as designed on Test or not.
Blaster: Flame Mastery
level 47 power that is not unlocking: Rise of the Phoenix
Prerequisite not counting: Melt Armor
Confirmed on Test: I unfortunately do not have a high level blaster on test in order to verify whether this is working as designed ingame or not. However, Repulsion Bomb, the new power in Force Mastery for Blasters, is working fine as prerequisite for Force of Nature.
Controller: Psionic Mastery
level 47 power that is not unlocking: Psionic Tornado
Prerequisite not counting: World of Confusion
Confirmed on Test: Negative, do not have a troller on Test, however prereqs for Flame Mastery seem to be working fine in the designer.
Scrapper: Body Mastery
level 47 power that is not unlocking: Energy Torrent
Prerequisite not counting: Physical Perfection
Confirmed on Test: Yes, the combos that should work but don't do indeed work fine on Test to open up Energy Torrent at 47. So yay, I'm not crazy
Scrapper: Darkness Mastery
level 47 power that is not unlocking: Tenebrous Tentacles
Prequisite not counting: Night Fall
Confirmed on Test: Yes
Tanker: Energy Mastery
level 47 power that is not unlocking: Energy Torrent
Prerequisite not counting: Physical Perfection
Confirmed on Test: Yes
VEAT: Soul Mastery
level 47 power that is not unlocking: Summon Widow
Prerequisite not counting: Darkest Night
Confirmed on Test: No, my test VEAT unfortunately does not have her patron arc unlocked
VEAT: Leviathan Mastery
level 47 power that is not unlocking: Summon Guardian
Prerequisite not counting: Arctic Breath
Confirmed on Test: No
VEAT: Mace Mastery
level 47 power that is not unlocking: Summon Blaster
Prerequisite not counting: Shatter Armor
Confirmed on Test: No
VEAT: Mu Mastery
level 47 power that is not unlocking: Summon Striker
Prerequisite not counting: Static Discharge
Confirmed on Test: No
Brute: Mu Mastery
level 47 power that is not unlocking: Summon Striker
Prerequisite not counting: Static Discharge
Confirmed on Test: No
Okay I spent a long time writing this up and my pizza is getting cold
Hopefully there will be a fix for this soon