"I'm coming soon!" is one English equivalent of the French phrase J'arrive bientôt!
Specifically, the subject pronoun je* is "I." The present indicative verb arrive means "(I) am arriving, arrive, do arrive." The adverb bientôt translates as "soon" in this context.
The pronunciation will be "zha-reev bya-tot" in French.
*The vowel drops -- and is replaced by an apostrophe -- before a verb whose spelling begins with a vowel.