No idea what they will come out with as thr 15202BC salmon dial could have served to be a great 50th Anniversary piece so I am throwing my hands up in the air.
If we think about the occasion, it would have to involve the Royal Oak somehow but again if it is a 50th Anniversary for the 5402 then it has to be something special along those lines.
We haven't seen a 15202 in full titanium, tantalum, or ceramic, have we? Gold and platinum already exist for this reference so that is out. Hmm π€