Melee Feral and Caster Balance.
Feral with Cat and Bear and Balance with treant and moonkin. plus both specs would have travel forms ofc.
treant form could have a skill kilke [Blend] that would work basically as camouflage for hunters does so that they are not missing out on "stealth" of cat form.
moonkin form would replace bear form's toughtness. Flap as anti fall damage skill or passive
Obviously wou wouldn't be able to tank and deeps effectively at the same time.
End talent points for both spec would define your "real" value at given role, but you'd keep all the tools for "off role", kind of reversed Affinity.
For Feral:
Ferocity: full deeps oriented
Cunning: a hybrid, between both, but worse at damage than Ferocity and worse at survival than Tenacity
Tenacity: full survival option.
they could be as simple as +30% damage, +15% damage done/-15% damage taken, -30% damage taken
but could be something else as well, numbers would be tweaked accordingly obviously.
don't have good names for Balance "affinities" yet tho ;P (wither for spellcaster, symbiosis for "hybrid" and growth for healer?) the idea is that instead of balance of sun and moon theme, balance would be all about of "circle of life" and "balance of nature" kind of balance.