Not just a rumour was to be anounced last week but probs with unservisable units caused a delay .
I dont see how problems with u/s aircraft would delay the announcement of a new base?
I dont see why they would go to the cost of agreeing advertising, ground handling and fees only to pull away at the last minute. Either the announcement isnt due for some time yet (arent Jet2 bases usually announced Aug/Sep?), or there are other issues that caused them to pull away. Could be wrong.