Everyone knew Harvey would sign in the last day/hour before the deadline and everyone was right, as he signed for a little for 2.5 million. He probably won't pitch in the Mets organization this year, but depending on how they view him, may try to get his feet wet in the Arizona Fall League. In my opinion that's not a place to get your feet wet, as the altitude and the advanced hitting prospects make it very tough on pitchers, especially those with so-so command.
The Mets also came to terms with 6th round pick Greg Peavey, the junior RHP from Oregon State. Peavey finished 6-3 with a 3.64 ERA and 72 strikeouts in 99 innings last year, and it's being reported he signed for $200,000, which is also over-slot.
Still as a whole, the Mets were very conservative in their draft this year, but I'm sure the Front Office/Ownership will point to these two players for years to come and say "see, we do/can spend over-slot when we feel it's appropriate."