Cpt weird,
There has been rumours about all type of aircraft since 2009 ( B777 , A330 , A340 and B787 ) we are mid 2014 and all I see is a growing fleet of B737-800 and still around 80 more to come...
So probably Flydubai will pick another type for the long term future BUT the real question is when ?
So my guess is that you will not see anything else than B737 flying under Flydubai colours for at least 5 years.
So many more pilots will be gone by that time and will never see it unfortunately.