Not likely.
From what I heared on their forums and ArM-list, Atlas emphasised that the dual-stats are meant to draw in d20 crowd to ArM, rather than be an d20-to-ArM conversion. Furthermore, they noted that doing such a conversion is not on their agenda.
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While the two systems have many similarities, I believe converting ArM to d20 is difficult, since the game-design philosophies of the two are different. The way I see it, you will need to abandon at least some of "holy cows" of d20: presenting the ArM way of gaining XP through training, and per skill rather than levels, at the very least. These kind of changes are profound, and the game essentially will not be a d20 one. (That being said, it would make "selling it" to my friends much easier.)
Should you choose to retain XP-by-Adventure, you will lose much of the focus of ArM (the wizard's lab and basic premise of the covenant). It might be possible to retain classes, but I cannot think of a class-based (as opposed to skill-based) system that will allow one to recreate the stock ArM characters (the specialist Flambeau, the generalist magus, the fighter-like Jerbiton or Tremere, and so on).
I am working, lasily, on my own such conversion. Other than the above, I see no inherent problem as long as you are willing to adopt solutions from both systems. (I use the ArM magic, the D&D initiative and combat but with ArM attack and damage, and so on.)
I would, of course, be very interested in such an official setting book. I value Atlas' products highly, both the ArM and the d20 products that I own. But most ArM players fear such a move, fearing it would both fracture an already small fan-base and, worse, that a conversion cannot be made without sacrificying much of what IS ArM. I tend to agree with the latter, unless "d20" is used very loosely.
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