I doubt too many people have played or seen the new Studio 3 guitars yet. I would guess, based on their recent moves (ie. 125 -> 130 -> Guitarra del Tiempo), that not too much has changed in the Studio 3 from the 4NE. My opinion is that Amelia is likely just trying to make her "mark" on the Ramirez brand, so is updating some of the cosmetics and maybe a few very minor structural changes to keep the guitar competitive.
I would guess that Ramirez still does all their design work. Afterall, they have many talented luthiers working in the Ramirez workshop too, along with Amalia. Being one of the most successful guitar companies, I'm sure they can still design and build a nice guitar.
So much Ramirez hate around here. I guess it doesn't always pay to be successful at what you do. Everyone always just wants to try and bring you down. Many Spanish companies have been outsourcing guitars for years. That doesn't mean they are lesser guitars. If they paid people in the Ramirez shop itself to build those guitars, it would likely be the same as them being outsourced and built anywhere else. They still do quality control and have written into the contracts exactly what they will get and how much they will pay for their exact model, I'm sure. That is how business works. The idea of a single luthier toiling in his/her shop to build 500 guitars just doesn't work with a successful company. It would be impossible to keep up with demand. You have to build in a way that makes the numbers feasible.
I have put my 4NE against many luthier guitars and it has never fared badly. Sure there are better guitars. It doesn't matter what guitar you buy, someone will always think there is a better guitar out there. Not everyone like the sound of a Hauser, Romanillos, or Smallman either, but you can't say they are not successful. To each their own.
I would guess that Ramirez still sells way more guitars in the midrange/high range than most of the other classical guitar companies out there. The only competitor who might give them a run for total sales in the mid-range genre is Cordoba or Yamaha. But, Ramirez also doesn't make too many "low end" models like Cordoba does. So, it would be hard to compare apples to apples. I don't think the 1A has any direct competition for high range production guitars, except maybe Sakurai/Kohno. Sure there are plenty of high range luthier guitars, but not likely sold in the quantities of the 1A.
2013 Ramirez 130 Anos - Spruce
2013 Ramirez 4NE - Cedar
1998 Dean Harrington - Spruce
1977 Kuniharu Nobe - Spruce
1971 Yamaha GC3 - Spruce