If it is a major announcement (which looks very unlikely, major announcements like an alliance or new airline partner would have had branding at the event - all we saw was a new "logo" and "slogan").
It's also pretty strange to have a media event 100+ hours before the embargo is lifted. It's a business day today - what's wrong with today? Who needs four days to write their articles? Not very
fast!
So my guess is there will be some minor changes to the program, possibly one or two new ground partners - something like lifetime status or dynamic reward pricing perhaps - but nothing that will "wow" the general travelling public.
Or perhaps the embargo is on the logo itself - it hasn't broken news on any other site or on the Velocity website. Not that it's exactly newsworthy.