It's difficult to answer this question because there is no way any of us can know exactly how the financial details are structured, until the stock market listing happens. Even then, it may not be crystal clear.
What I feel is happening:
1. Bee's investors (If any. No one has come forward yet) and Doyen buy 48% of Milan. This money will come from either a) actual money or b) Doyen buying players and using them as equivalents of money in the balance sheet.
2. Doyen Sports' involvement is highly unlikely to be just advisory. Their business is essentially trading (of players) and I refuse to believe their scouting potential is any better than that of a typical well-networked scout. They buy players cheaply, and help grow their value by sales in the transfer market. With Milan, if they've actually bought into the club (as Platini suggested), they've found a way around the third party ban. Now they are officially stakeholders in the club and so not a third party.
Imagine a company of which, say, 20% is owned by a recruitment agency. This recruitment agency sits in the company's office and is purely concerned with recruiting and firing employees. They spend the money required to hire employees and they sell these employees to other companies when they want to. This agency has its own P&L in addition to the company's P&L. In my mind, what Doyen wants to do with Milan is something like this recruitment agency's work. Milan will profit because they will enjoy the work of the employees hired and fired by the agency. And they dont have to worry about finding money to hire them.
3. Transfer market money for 2015/16: This is tricky because we still dont know how much Milan would invest. I think it'll be a fairly good amount and I think Fininvest and Berlusconi will fund all of this. Why are they spending now since they didnt spend in the last few years? Answer is two-folds:
a) Bee will float the club in the stock market and the club's valuation, initial price etc is likely to depend on the asset base. If you invest now, there's a good chance that you get a better valuation. In short, this is the time to invest since club shares will be sold to the general public very soon. Berlusconi and Fininvest would naturally want the shares to be as expensive as possible.
b) FFP rules are going to be relaxed after lobbying from several clubs, particularly Milan, Inter and Roma. This is because these three clubs have had recent ownership changes and the new owners feel it's unfair that they can't invest beyond means while PSG, City etc got a chance to do that before the rules were enforced. Therefore, Milan and Inter particularly have a chance to spend some money in the next couple of seasons and still be clear of FFP when they qualify for Europe.
All speculation at this point, but we will know some more information when the 8 week period is over (another 6 weeks to go?) and then a lot more when the club is listed in the Asian market.