The Gen11 architecture will make its debut with Ice Lake and features DisplayPort 1.4a as well as VESA DSC (display stream compression). This will enable systems with the future Ice Lake CPUs to support display resolutions of up to 5K (5120 x 2880 pixel) with 120Hz refresh rate, or 8K at 60Hz.
As TPU points out, this big increase is needed to support the latest screens:
Without DSC, 5K-120 Hz requires 42.4 Gbps of bandwidth (not counting interconnect and protocol overheads), which even DisplayPort with HBR3 cannot provide, as it caps out at 32.4 Gbps. DSC offers "visually lossless" compression of the 5K-120 display stream down to roughly 14 Gbps, which can be comfortably handled by DisplayPort 1.4a. 8K (8192 x 4320 pixels) at 60 Hz also becomes possible. Merely supporting these new high resolutions doesn't imply Gen11 iGPUs can game at those resolutions. Support for them is necessitated by rapid increases in resolutions (pixel densities) and refresh-rates of high-end notebooks and ultra-portable devices.
When you can expect Ice Lake remains a bit of a mystery. This architecture is intended for Intel's 10nm process, which is suffering from multi-year delays. At the moment, it looks like Ice Lake is a 2020 part.