This phrase implies that someone is learning a language or skill, and they will soon be proficient in it, speaking like a native speaker or an expert.
For example:
* "Y pronto vas a hablar como un mexicano." (And soon you'll be speaking like a Mexican.)
* "Y pronto vas a hablar como un abogado." (And soon you'll be speaking like a lawyer.)
The phrase usually conveys encouragement and optimism about someone's progress.