Not entirely sure yet - I have two thoughts on this, the E195 wasnt used to its full potential even in the summer when it was often seen doing the MAN sectors. In theory you could get 3 spanish destinations out of it during a day with an early morning start and a late finish.
Or, as suggested in a recent staff letter the Q400 that is being removed from Exeter for the winter may be replaced by a E175. This may be the one used for Barcelona as it will be a new route and new destination?