I don’t know about oculink stuff, but it would be lovely to see a battery extension which also had some extra io on the back.
Indeed, these threads in this community are the reason why I am waiting, would prefer to buy from someone here 
For the people that wants the battery on the module, think again, it was popular back on the day because it was the only way, but given the current state of affairs, if you just want battery expansions, one is better off getting PD powebanks that can not only charge your laptop but also everything else. And are easy to substitute, on the other hand a custom battery attatched to your module can be very challenging to deal with in the future when it eventually ages as all current batteries do and its time to replace, so you’d have a battery that can only serve your laptop and very much harder to find replacements of
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