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MY'09 should have a refresh, which means most likely new headlights/tallights, grill, spoiler, minor changes to front and rear bumper, interior/exterior color combinations/options, a new wheel perhaps, and the such.
For example, the '08 GS got all of the above mentioned changes. Even the font of the text inside the car was changed.
'08 GS were available in October '07, so I would imagine that the '09 IS will be available by October '08.
I don't know I like the aggressive design of the tailights right now. I hope it isn't too much of a change...