Qatar has now changed its booking classes, as summarised
here, including changing Z to I. The BA.com page for earning on non-OneWorld parner airlines remains unchanged, with Z earning but I not.
Let's home that changes pretty quickly (nudge nudge), as it will affect travellers both before and after the OW integration.
Ahem, the booking classes remain unchanged despite Qatar realigning their fare buckets. I really do hope BA's accepted fare classes will change by the time Qatar join OneWorld, otherwise there will be a lot of disappointed travellers. Including me.