How many will the AF get? About a dozen or so?
If the deal is only for Qatar Mirage 2000-5 entire inventories (including all supporting packages and armaments) then it is for a dozen. However the question (which now seems in more sensitive negotiations, which is why Puspen TNI take down that original tweet), is on UAE Mirage 2000-9.
Officially MinDef and TNI only admitting they are in negotiations with Qatar for Mirage 2000. French approval is a must. However since all related parties (Qatar, Indonesia and potentially UAE) are all Rafale current and future customers, most likely Frenchie will given goes ahead. It is good business for them anyway.
Rumours on whose going to get those 56 UAE Mirage 2000-9 has been running around for this past couple of years, especially after UAE bought 80 Rafale. Before Greece, Maroco even Egypt comes as the potential takers, but lately Indonesia also comes as candidate.
Speculation now coming on Greece and Indonesia. Both New Rafale customers, and both will use those Mirage 2000 as interim fighters until their Rafale orders operational. For Greece it is also augment their existing Mirage 2000. UAE Mirage 2000-9 consider as the most advance version of Mirage 2000, thus potential even Greece going to use that to replace some of their older Mirage 2000.
Still for TNI-AU until it is officially clear Indonesia also interested with UAE Mirage 2K, then I can only say currently the discussion is for a dozen Qatar ones.