The spectrum community forums website high-split post has been updated to mention that 5×1Gbps is expected in 2026 and 10×1Gbps in 2027 along with FTTP 25×25 fiber on demand to follow after that.
Right now it seems in phase 1 2×1Gbps active areas there is 32 SC QAM, a 192MHz OFDM channel and a second OFDM block that is 96MHz. Spectrum analyzer shows 258MHz to 941MHz used for the downstream in my area now. They added 192MHz of OFDM capacity Tuesday morning as it looks like someone added the 2gig tier in my area. OFDM PLC’s are 662MHz and 854MHz.