Lots of juggling about at the moment and like you say they have said they are open to offers.Anecdotal evidence I know but over the years I have spoken to many people who travel regularly to the likes of Poland and Romania from LTN when direct flights are available from Birmingham as Luton has a greater choice of frequency and the prices are usually cheaper.
Just as an example a one way flight to Bucharest on Nov 24th with Wizz from BHX is currently showing at £77.99, the same date from Luton is £34.99, less than half the price. From Luton you also have the choice of three flights per day compared to three flights per week from BHX. Even so Wizz generally get good load factors out of Birmingham and seem to be making decent money so the demand must be there but whether a potential BHX base would dilute LTN and to what extent only Wizz would know.
Loads everywhere do seem good for Wizz it's probably the same for each airport they fly to making money wise too with the cheap as chips model they have successfully implemented Europe wide.
I do hope so.
I get the feeling that the next few years will be mostly about LGW, I could see them going very big there. I've always thought that DSA was the most likely candidate for their first base outside of London, it seems a good destination for Wizz.
They look to be open to offers at the moment so who knows what will happen.
I would think any UK base outside of London would be for 2 or 3 aircraft I guess the factor that would possibly play against Birmingham may be if easyJet got in first if they and if Jet 2 increased an already sizeable operation squeezing Wizz out however at present I assume that the airport still has fair amount of scope for more sand and sea after the demise of Monarch and others at the airport. Wizz would be certainly bringing sand and sea on top of the current Eastern Europe schedule the next question would be how they would work a schedule to suit both the summer and winter seasons with the allotted 2-3 based aircraft.