Share dilution may be imminent any time a company needs additional capital. The potential upside of share dilution is that the additional capital the company receives from issuing additional shares can improve the company's profitability and the value of its stock.
Today was mostly accumulation, I think, so I'd venture a guess that 3B-4B among us currently... 4.6B in play sounds about right for the amount of people getting in and out. That's up from 1B O/S last month. Unless every single original share got flipped today it has friends.