Update: I see 4Z awards now available on UA.com. Only coach awards available for now, and they appear to book into the F bucket (not first class).
I'm seeing 15.5k for one-way direct flights within South Africa and to/from Botswana and Namibia, which does not compare favorably to the 8.8k prices for domestic awards on SA or intra-EU awards on LH/LX/etc. If you add a connecting flight, the price jumps to 25k.