Should you level as Arcane?
Blizzard's October 1 Beta development notes raised the playable cap to Level 30. These 11-point Mage routes preserve the initial Level 20 snapshot, and no Level 30 allocation is verified here. Official source: https://us.forums.blizzard.com/en/wow/t/wow-forever-beta-development-notes-%E2%80%93-updated-october-1/2360696
This is an editorial alternative for comparing eleven-point allocations. The reviewed 69913 selected-rank text gives Arcane Focus a 5% Arcane spell hit benefit, Arcane Concentration a 10% Clearcasting chance and Arcane Impact a 2% Arcane spell critical strike benefit. Clearcasting reduces the mana cost of the next damage spell by 100% when it occurs; this allocation does not establish a guaranteed proc, cast reliability or leveling speed. This reviewed Level 20 starter allocation spends 11 points. Blizzard raised the playable Beta cap to Level 30 on October 1; this route is not a reviewed Level 30 build.
The 11-point route
Arcane Focus 5, then Arcane Concentration 5, then Arcane Impact 1. Arcane Focus goes in immediately from the entry row; Arcane Concentration opens after five Arcane points and five ranks of it consume the middle of the build; the last point lands on Arcane Impact, which sits behind a ten-point requirement.
Phase 1 of the tree, and what comes later
This Level 20 snapshot covers the first phase of Arcane. Later rows require more than 11 points: 15 for Arcane Shielding and Improved Counterspell, 20 for Presence of Mind and Arcane Mind, and 30 for Arcane Power. Those gates are client data; this page does not turn them into a Level 30 recommendation.