Upgrades to the Wadia 581 SE

Has Wadia made any upgrades to there 581 SE since they introduced the SE version? For example the transport, software, DA conversion etc.
If you need the inputs you could upgrade to the i version other than that Wadia does offer upgrades to 781 check their site they were offering the 781 upgrade at a discount.
iirc, there is a usb input "upgrade" coming.