Bagso,
I think a slight re-read of the article is needed:
The carrier said it hopes to add to its eight-strong fleet of aircraft by the
end of 2015
Airline easyJet today pledged further investment in its Manchester Airport operations over the next two years
That to me suggests growth between now and the end of 2015, as it states over the next two years, not in two years time. Yes the end of 2015 is now a while away but there is no defined period as to when the growth will come.