It's an old marketing trick - you tell people there's going to be a big announcement to get people's attention, but when the time comes it's almost always something pretty trivial.
BIG ANNOUNCEMENT TOMORROW with airlines usually ends up being something like 'we're going to add an extra weekly rotation on a route which we happen to already fly 5 times per day'.
Flybe is a company listed on a stock exchange. There are very strict rules about the way information that may affect the share price is disclosed. If marketing are using the 'big announcement' trick it will almost certainly not be anything particularly significant to Flybe.
<cynic mode = off>