Ever since Maserati came under the Fiat umbrella the brand has never been allowed to outshine the Jewel in the crown, Ferrari. The Maseratis have always had previous generation Ferrari technology and "detuned" engines. Further to that, they have never shared the mid-engine layout and are much more orientated towards the GT market. All of which makes perfect sense amongst Fiats group of brands.
I can't see any of that changing now. Why market a mid-engined sportscar that will cost the same to develop as a Ferrari and necessarily go to market at a discount to the prancing donkey? You will have less profitability per unit and on top of that you will steal sales away from the more profitable Ferrari brand.
The only counter arguement that I can think of is massively increasing production volumes at Maserati rather than destroying (further than it already has) the illusion of exclusivity by ramping up volume at Ferrari.
Latest press release (and those more recent) clearly states their intention to massively increase volume across a range of existing and newer models ie SUV.
Also declared they are targeting Audi (R8?), AM & Porsche(911) with their new lines. Arguably these brands are a rung below the Lambo/Ferrari segment so its probably not going to impinge too much on the F brand and potentially a good revenue/profit generator if they do it right.
If they go down the mid engine path, presumably there are synergies with the 458 to lower production/development costs, as in what occured with the Alfa 8C/4C and engine blocks from F
But its all speculation & supposition