My understanding is that the new owner does not currently want to publicise their plans too widely, which is why there is limited information available.
Although their plans are great for the short term, in the longer term a use need to be found for the site that is welcoming for all and not publicity shy. This is a prime location on the parade that needs to be utilised as such.
If we can't have a vegetarian restaurant then I vote for a sushi restaurant. There is a serious lack of quality sushi restaurants in Dulwich / West Lewisham. And HOP is the dining capital of South East London!