Monte -
I think many are / were curious about the APEX. It will be interesting to see how it does as more folks get time behind the controls using it in the field. It isn't Garrett's flagship, but I imagine it will take over top dog in their Ace series of detector. I haven't seen mention yet of accessory coils. Looking at Garrett's accessory line for their other models, I think it will be options will be available sooner than later..
With the recent turn of events with Garrett purchasing the intellectual properties of White's Electronics, they may have given themselves a serious boost up in their progress in the SMF world.
As for Nokta / Makro, I know they've intended to join the Simultaneous Multi-Frequency market. I imagine the challenges of SMF are significant or everybody would already have offerings.
Rich -
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Just One More Good Target Before I Go . . . .
800 / Deus