A chinese leaker claims he got to test the future 4.02 and 4.04 Sony A1II firmware. This is what he writes:

4.02 will add new white balance algorithm same as A7V ;

4.04 will add burst shooting mode like A9III (surpass 30fps) and maybe unlock the support for CF-A 4.0.

A1II major firmware update:

5.00? will add [4K angle of view Priority] like A7V in order to achieve over-sampled 4k60p recording with small crop (unkonw crop ratio).

Can’t guarantee that the final outcome will match, maybe all new features will come along in one major FW update.

Source: Bilibili.com