hey ZvjerOPC. the surface connector doesnt have thunderbolt 3, but there will be a usb-c dongle that attaches to the connector made by microsoft. information on that is available here
https://www.theverge.com/2017/5/23/15674254/microsoft-surface-usb-c-dongle?via=indexdotco but the tl;dr version is this dongle allows for both charging and data transfer via usb-c. not sure on the release date or price yet. the surface dock doesnt have usb-c or thunderbolt so it wont give the surface products thunderbolt capabilities, so your best bet is getting this dongle when its released. on the plus side, at least its lighter and more portable than the surface dock.