Others have posted, but to make sure Google indexes this baby high, I figure it's my duty to post a link to Michael Bird's email interview/chat with Stanley Porter. Be sure to read the comments, and also to read Michael Turton's reaction.

If I'm reading Porter's comments correctly, I'd guess he thinks Reuben Swanson, with his New Testament Greek Manuscripts (more on that here), is on to something. Michael Bird dabbled a post (actually, two posts) on the topic of commentaries based on NT Manuscripts; I interacted a bit with the idea as well.

Lastly, to Michael Bird, congrats on the book!