Very likely will be filed under the "just another ASCO" category when all is said and done.
I do think MB will have some very interesting combo information to share, and that will be worth paying attention to from a long term/science vantage. Nothing that will impact NWBO share price, though.
I think the biggest wild card is if something slips (intentionally or otherwise) about a timeline or milestone. i.e. MB says "we're hoping to have the application submitted very soon" or "once this expansion (at Sawston) is done we can submit for marketing approval;" something to that effect. Doubt it, but worth tuning into just in case.