Questions were directly from enthusiasts -- like us. So, the answers were a bit more relevant than we often get.
Mr. Koduri seems to say Vega gamer cards will be slightly faster than the Vega professional cards being released soon (the pro edition will do games just fine he says). They will also be cheaper than the pro version and high-end Nvidia cards.
He notes that HBM2 memory will be faster than it seems to be based purely on "memory speed" and "GB" numbers. Apparently, its accessed differently than normal DDR memory and is faster in practice. Also, for example, 8GB HBM2 can perform like 16GB of DDR5 or DDR6 in some situations.
However, the release date of Vega gamer cards is still not publicly available.