So we know Google is testing that mobile first index and that the rollout will be done in batches and now John Mueller has explained how they think they might roll this mobile first index out.

First, it is likely that based on those classifiers, which we mentioned here, that Google will roll out the first batch to pages that are equivalent between desktop and mobile. Then, Google will likely begin some level of communication, be it via blog posts, direct communication and/or Google Search Console notifications for those who have issues.

Google may classify a percentage of the web pages on the internet as having issue X, when it comes to this roll out and notify them all via Search Console with steps they can take to resolve the issue. Then the same with issue Y and Z. As Google is able to classify more and more issues, they can aid more and more webmasters on how to fix these issues so the rollout has quality neutral release.

Here is the video embed where John talks about the plans for the rollout:

Transcript:

I am on the lookout for these messages, as they roll out and will keep you all posted.

Forum discussion at YouTube.

This post was scheduled to go live today but was written earlier – I am currently offline today.