Shin Lim discusses some of this on his At the Table Live lecture. He discusses lots of things so there is only a bit on this, but it's a good lecture overall.
I've got Hondo's 2.0 (excellent) and am working my way through it now; I'm just curious as to whether anyone has gotton both Hondo's Flap 2.0 AND Blake's #4 and has anything to say about the pros and cons of either. Since I already have Hondo's, would it still be worth picking up Blake's #4? (I'll add that I have his split sessions #1 and #2 and they're excellent, with a big plus being the extensive verbal descriptions.) I do wish Hondo's had additional verbal content -- even explanations in Mandarin would be a huge bonus for some of us. Is there anything new in it that I wouldn't get from Hondo's? In particular, Blake's statement "and acro cards that can change on command... hands free!" caught my eye. Feel free to answer by PM if you prefer.