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The vector extensions would need to be finished before that can happen.

As a side note, a couple of jobs on their careers page seem to want ARM assembly experience...so it's likely to be an ARM core?

Yeah, they mostly avoid being specific, but there's a few ARM callouts on their job listings, like:

"Knowledge of library cells and optimizations from ARM, TSMC, and other high performance library vendors"

"Familiarity with coherent bus protocols like ARM AMBA and CHI bus protocols"

Even without ARM, I can see them using AMBA or AXI for the bus because there is so much existing IP out there built to that interface.

And they're fairly emblematic of modern SoC bus protocols. You'll be fine jumping to TileLink or whatever if you're used to AMBA/AXI.