Arcane
NEW Arcane Barrage - Arcane Barrage grants you 2% of your maximum mana per Arcane Charge spent.
NEW Arcane Explosion - Damage increased by 10%.
NEW Arcane Power - Duration increased by 5 sec(though increased cd to 3 minutes)
NEW Clearcasting - When Clearcast, Arcane Missiles fires 1 additional missile.
NEW Clearcasting - Clearcasting can stack up to 2 additional times.
NEW Conjure Mana Gem - Conjures a Mana Gem that can be used to instantly restore 10% mana, and holds up to 3 charges.
NEW Presence of Mind - Arcane Blast can be cast instantly 1 additional time.
NEW Prismatic Barrier - Reduces magical damage taken by an additional 5% and duration of harmful Magic effects by 10%.
NEW Slow - Reduces the target's movement speed by an additional 10%.
NEW Touch of the Magi - Applies Touch of the Magi to your current target, accumulating 50% of the damage you deal to the target for 8 sec, and then exploding for that amount of Arcane damage to the target and reduced damage to all nearby enemies.
Talents:
NEW Enlightened - Arcane damage dealt while above 70% mana is increased by 8%, Mana Regen while below 70% is increased by 20%.
Tier 6 Talent, in place of Touch of the Magi
NEW Focus Magic (Talent): Focus Magic grants an ally a slight bonus to their spell critical hit chance; in addition, when the ally critically hits with a spell, the Arcane Mage receives the same boon for a short period of time. This was listed for all specs but it says spesifically Arcane Mage here.
Looking at these changes I must say it looks really promising being Arcane in Shadowlands. That new talent, Mana gem, mana back on arcane barrage(like the legion legendary) another clearcast and longer Arcane Power, but with double cd. Arcane in BfA have felt lackluster compared to Legion and other expansion but these changes can really make a great difference. Playing with the mana is the arcane fantasy for me and they are going back to that if we are to believe these changes.
Looking forward to playing Arcane in Shadowlands!