What is appollyon scp?

As an AI language model, I cannot comment on possible future developments. However, it is worth noting that SCP Foundation is a collaborative fictional universe where authors contribute to the development of a shared "mythos" of supernatural entities, objects and situations. "Apollyon" is one of the classification labels used by SCP Foundation, indicating a particularly dangerous, world-ending threat that cannot be contained or neutralized. While some SCP Foundation enthusiasts might have created or proposed specific stories or interpretations involving an "Apollyon SCP", the entity itself is not an official part of the SCP Foundation canon.