After Andrew Navaro dropped the truth bombs on us today , I asked in the Twitch chat how long FFG OP is planning on supporting Imperial Assault.
The Twitch Chat Moderator replied: "OP support for it will be winding down. More information will be available soon."
I recall seeing FFG OP posts on Facebook that mentions IA World 2020 at Adepticon. I think we can reasonably expect that, if IA Worlds 2020 happens, it may be the last official FFG OP event.
If you'd like to continue playing competitive skirmish, the IACP will be organizing events in 2020. Stay tuned for more information.