。
Next year I'm going to learn French.
Literal
Next-year I [topic-は] French [object-を] learn.
習う ('to learn' especially via instruction) contrasts with 勉強する ('to study') and 学ぶ ('to learn / to be educated'). 習う specifically implies learning under a teacher or through formal lessons — fitting for a language class. The plain non-past 習います both refers to future action and habitual present.