... starts Wednesday 28th June.

Is that just auto top-up or other top-up instructions too? Auto top-up
seems to have been working on the trams for a few months now on the quiet.

Some may consider it bad form to follow up ones own post, but never mind...

Having auto top-up working on buses and trams will be a big improvement but
there is still the issue of collecting the initial auto top-up instruction
for those who don't yet use it. "Ask Oyster" is now stating that this may
collected from a nominated tram stop, as well as DLR or tube stations.
Hopefully it might also prove possible to collect other instructions such as
online top-ups and season ticket renewals at tram stops too. Good news for
those who use the trams but still not much help for those who mostly just
use buses. There still seems to be need for dedicated Oyster collection
points spread around the bus network.

G.