I'm not dale, don't know his plans, but I have handled micarta and G10 (the G10 Dale offers on the 4's as a matter of fact.) I like G10 it's nice material, very sturdy stuff, I'd say easily as sturdy as (if not more than) G10. As far as texture (grippiness) micarta naturally provides more grip than untextured G10. The G10 slabs that I got from dale offer a bit more grip than plain G10, they have a little bit of roughness to the surface (note little bit, not whole lot). Micarta (as offered standard by ESEE) has a little more grip/texture to it naturally.
Hope that may help just a wee bit. Also, if you go to Dale's site he has an email contact which he is really good at responding to. Though, either way, I'd be curious to know if he will offer micarta myself.
God bless,
Adam