I think if the new Amiga is to be a succsess i would suggest that just like when the first A1000 came out back in 1985, the new Amiga must be GROUND BREAKING, not just a machine which can run OS4 etc...
They should design a games console, but more powerful than the Playstation3 or Xbox360 with better processing power, better graphics hardware etc...
From that they should turn it into a computer with expansion slots, built in wifi etc.. and have it packaged with a Amiga branded keyboard/mouse and the latest OS4.
With such powerfull hardware and maybe a good ad campaign they could get 3rd party support for games (such as from EA or Activision etc...)
Maybe in the future even release a smaller version (with no Xorro/PC slots etc..) and it would be a kind of moder A500 games machine yet still a computer at the same time.