I will miss Hidden Thief granting stealth. It was another source of stealth, especially for regular thief's Steal, and instant too, but I really like the barrier/condi removal for the other two (Shielding Restoration/Shadow's Embrace), so I will change to one of traits regardless if Hidden Thief still affects Deception Skills (the wording was unclear to me).
I overall like the change of Enter/Exit stealth instead of duration. The duration made it feel like you had to hide in stealth for a bit and then continue attacking, which is a fantastic thief fantasy but unfortunately the gameplay looks mostly healthier with more player agency and control with Enter/Exit.
Cover of Shadow and Shadow's Rejuvenation are really nice in the situations where enemy boons aren't the niche.
I worry for Meld with Shadows. I liked stealthing and running around, but Superspeed is huge especially if it persists a little bit after exiting stealth, which seems really cool for burst attacking.
I think I like the Shadow Arts changes, speaking as someone who only plays in all open world pve, story, and fractals.