According to their post, they are authoring their own discs, like with Naruto part I.
I wasn't a fan of the VIZ upscales for Shippuden (so much so that I stopped collecting the Blu-rays) it's made some of the line work all jagged compared to its SD counterparts.
The pre-HD episodes would really benefit just being put on SD-Blu-ray (not everything needs an upscale!). In fact, the entirety of Naruto part I should have just been SD-Blu-ray, imo.
Shippuden is a weird one because the first 53 episodes were produced in SD 4:3. Then, it goes SD 16:9 (widescreen) from episode 54 to 150-something, and then it makes the transition to 16:9 HD for the rest of its run.
It'll be interesting to see how it turns out. I will add though, I think the artwork on our cases look much better than the US VIZ ones:
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