Considering I downgraded back to the oldest possible* version of Gmail on my phone as soon as Google started the "split the inbox by labels" insanity, I very much doubt this will be coming to my phone. Not if I can help it anyway...
* Yes, I know the Play Store doesn't offer the option to install a specific version. Which is why any apk installed or updated on my phone gets automatically archived. It's slightly safer than using an "oldversion" site to do the same.
I don't like frequent updates. It sucks. All Google apps should update once in a year.
Google should implement translation and external apps support (like grammarly), just like desktop version does.