Just got an notification of another post on another thread about AUv3. Of course, I'd love it to be added but we can only speculate that there are issues in retro adding into what is now quite old code.
Utilising the new processor power in latest ipad air would be a great place to shoot for. Re-write the code (Cubasis v2 to v3 is a relevant case in point). It makes sense, within a year an improved ipad pro will become the new king of iOS and a rewritten up to date SampleTank app would fly and put IK Multimedia back up there in the mobile market.
That's my wish list, a complete overhaul. Yes, it costs money, but SampleTank iOS has had a great run of 8 years on the app store, bring SampleTank into 2021 and get it back into the forefront of people's go to sound choice.