There's been little discussion of any substance unfortunately. I've mentioned a few times in the past that balancing after charging on the 1st-gen Kona can be witnessed using a BM2 as the BMS runs entirely off the 12V battery when the traction battery is offline.
I've seen this after every home charge where I use a 2kW
EVSE exclusively. This was one of the longest durations at 4.5 hours. it appears to be programming the individual cell-group loads every half hour to suit the corrections needed, then sleeping in-between.
I've only been made aware recently that it also likely takes place while charging. There's an
interesting article about a Ioniq 28 owner who was focused on getting the best possible range at 100% charge, which requires the highest possible pack voltage be obtained when charging stops. In a nutshell he found that balancing was too slow to keep up while on a 7 kW rate. Slower charge rates generally resulted in higher final pack voltages. This voltage variation (of about 5 volts) had been noted among Kona many years ago but no one even recognised (or cared) that it affects range slightly when you've already got 480+ km.
The concern I have relevant to this thread regarding the BMS update is that with (3) cells hard-wired in parallel per series group it's exceedingly difficult to detect a single failing cell. My original (Sept-2018) pack always had one particular cell-group low by the (minimum readable) 0.02 V (which I'll assume means it could be as bad as 0.039 V since 0.04 V is the next readout increment).
I only recognised later that the fact that one group could never could achieve a closer balance was the unmistakable sign that one cell was continually self-discharging at a very low rate. The 'MIN cell' value was always #54. I monitored that situation periodically for four years and it never got any worse but I really should have asked Hyundai for my replacement battery sooner. The new pack has always had perfect (<0.02) balance.
This new BMS update needs to look for trends like this to spot problems. The 2nd-gen Kona and Niro has only one cell per group which was a smart move to side-step this issue.
