TL;DR

Porto awarded an order for 18 trams to the Chinese firm of CRRC Tangshen in
2020:

35M length, 80kph max, double ended, 7 double doors per side, 252
passengers, 64 seats, five year maintenance period, AUD $4.4M each.

The design has been revealed recently. The link shows what they look like.

https://www.cs-dopravak.cz/prvni-cinske-tramvaje-pro-eu-porto-ukazalo-design-vozu-z-crrc/?fbclid=IwAR2boQeL9ba1kD3emYHdy4AXD5hTJXqlIevj_VTczdM_64YAVPyYuw49QUQ