Well for now all I can go by is what we already have regarding Yamaha arrangers & all the models I've owned so far. The MFD I can live without the transpose save if its not incorporated in T3 hoping it is....
I would assume at least the same key-bed as T2 which I enjoyed alot. Tilt display is a must compared to my S900. VH is another story if its not improved I will be using an outboard unit like TC Helicon harmony 4. lets face it No arranger on the market now or in the future is ever gonna have it all.... so you weigh Your NEEDS Plus/Minus & see whats best for you. I know what I've had already & sold is NOT for me for many reasons....But Yamaha's sounds, styles, support, weighs heavily in the mix for sure.
Now whatever else will be added into T3...eg: drawbars, etc, etc, will sweeten the pot for sure we'll see but as of TODAY that is my choice.