Still not much data out on the trinkets beside basic stats. I would assume that they had learned their lesson and will consider atonement a healing spell but who knows. Any spell that heals should be "beneficial" in my book but i can see how it is hard to balance around disc talents/spells.
I don't think DA should ever be counted as it is just a side effect of another spell so it would essentially double dip.
edit: the mana one is cool depending on the icd. I just breezed over them this morning. Makes me long for double solace again.
That's one of the reasons it's so confusing. Almost everything Discipline has, from glyphs to core abilities, are just "double dips" or side-effects of other spells. Most of Discipline's abilities are not considered heals, and many are not even considered spells (like Divine Aegis and Atonement).
The few abilities that I know will work with the new trinkets (Renew, Heal, GHeal, FHeal, PoH) are all spells that I don't use often enough to activate a trinket, or I only use them when they are augmented by Spirit Shell (which makes them side-effects, not "spells" or "heals").
I have a feeling that they won't work well with Discipline, because of how they are worded. The 5.0 trinkets like Spirits of the Sun are all worded like this:
"Each time your spells heal, you have a chance to gain #### Spirit."
Trinkets like that have traditionally been worded to say that whenever something causes healing, it can activate. Whenever it says "healing spells", it implies that it is the act of casting a specific healing SPELL (like Flash Heal) that activates the trinket. So if the spell you cast (like Smite) isn't classified as a healing spell, it doesn't work.