Важного для нас вроде ничего:
Dialogflow's V2 API has added some new features not available in Dialogflow's previous version:
Audio Request Support - You can now send Dialogflow recorded or streaming audio to allow your users to talk to your agent directly
Agent Management APIs - These new APIs allow you to import, export, and restore your Dialogflow agents with API calls
Enterprise Edition - Dialogflow's enterprise edition offers features like a service level agreement, eligibility for Google Cloud support, and Google Cloud's terms of service
https://dialogflow.com/docs/reference/v ... tion-guide
Но эта фраза всегда присутствующая на экране "Dialogflow API V2 has officially launched. It is now the default API for all new Dialogflow agents and all new features will only be released on V2" наталкивает меня на мысль, что со временем v1 вообще отключат....