Not having to R&D/build their engine would save approx $100M right away. Thus the next big challenges for potential owner(s):
1) retain financing for 09 season
2) retain new sponsors (perhaps 7-UP or Heinekin to be able to save $$ to re-use green pants from '08)
3) retain engine supply deal
4) modify new chasis design to merge with new engine
5) retain/negotiate contracts for drivers