Found this from the SKSE team on their mod forum:
"We are actively in touch with the SkyUI team. The major hold-up for SkyUI on SSE is actually the internal SKSE64 work to support it. Snakster did that originally for SKSE. We are investigating and will implement the SKSE64 hooks that SkyUI needs. Once that work is done the effort to get SkyUI up and running should be minimal. Whether the SKSE or SkyUI team does that final bit of work doesn't really matter. It just means that we're going to make sure we get SkyUI for SSE."
Sounds like SkyUI is all but guaranteed whenever SKSE is released.