My pennies worth.... I expect Tiger will be wet lease, maybe 2 aircraft, 737/717. The idea behind Tiger is to stifle the opposition, and put pressure on the incumbents to cut costs. When the dust has settled, in maybe 2-3 years, it will be proclaimed that western low cost = poor service, and in asia this does not work, and so Tiger will be quietly wound up. Value Jet and air asia will of course have had their teeth extracted by the SIA Tiger dentist to render them a bit player.
SIA will emerge even more dominant, with its crews firmly under the thumb. Maybe.