grexx is dead, that openpci thingy...sure it might become a hit but its VERY unlikely to happen
Openpci is very important! It may allow A1 users to use drivers for PCI cards written for amithlon or MOS. For a start, no-one is going to invest the time in doing certain drivers for A1 (like catweasel), just like nobody did for Pegasos. With openpci, a single driver can cover Amithlon, grex, A1, Pegasos, and Promethius. (But not Mediator, which has been excluded from openpci development for dirty tricks on the part of its designers).
Seriously, if openpci doesn't make it to A1 then OS4 is seriously screwed for any card that hyperion don't support directly. The userbase simply doesn't have the numbers or the talent to churn out drivers, and that goes for any current Amiga solution.