Fairly surprising news, new customers for both have been rare lately, Wildcat certainly hasn't lived up to its name on the export market (surprisingly since SuperLynx sold quite well).
I would speculate the Wildcat operator will be a smaller navy, perhaps corvette equipped. Far East would be a sound bet, possibly even South America but that's less likely.
A Merlin operator would be a larger Navy, assuming it is an ASW variant they are talking about, Middle East or Far East seems a better bet given the costs. I'm not aware of any recent high profile RFPs for ASW helicopters, but its possible I've missed an announcement somewhere.