Unless what has been revealed so far is incorrect, the listed weight of the Tyros5-61 is slightly less than that of the Tyros4.

Here are the latest specs listed for both 61 note models:

Tyros4 ......14.5 Kg (~32.0 lbs.)

Tyros5-61 ...14.0 Kg (~30.9 lbs.)

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.