Hi,
Welcome to Lenovo Community Forums!
Apologizing for the inconvenience caused and thanks for the patience. Windows 8.1 is totally a new approach and cannot be just considered as an update to Windows 8. Hence, the compatible drivers has to be redesigned so that they work properly in Windows 8.1. As of now, I cannot commit the exact arrival date of the missing drivers for T430u. You can expect it in a few days, maybe a week or even a month for the full and final release of all the drivers.
Best regards,
Mithun.
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