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Maybe because MS, Google, Apple and Amazon have all either designed or commissioned fonts Rakuten wanted to join the club?
At 167 dpi (and 72 dpi to 133 dpi of PC screens, maybe also for the subpixel addressing such as Cleartype) you need specially designed fonts? But do you really need to design fonts for 220+ dpi and 300 dpi mono eink with 14 in between grey levels (no colour screen sub pixel addressing)?
I've not even bothered to look at these fonts as I read mostly on "publisher font" and replace that using Calibre if it's obnoxious, if Georgia doesn't suit.
I know on the 167 dpi Kindles one struggles with font at smaller sizes, but on 300 dpi?
Even the original H2O and Nia don't need special fonts.
The Sony PRS-350 is only 800 x 600 but because it's only 5" any font looks far better than on 800 x 600 6" Kindle or the 9.7" DXG at the same size. The DXG is particularly ghastly due to fewer built in than KK3 and no font embedding.
So I don't think these two fonts are a significant upgrade. The Swipe down, which includes Notebooks and works on Notebooks (Sage & Elipsa) and more bug free is the good bits. Seems safe upgrade from 4.32x version.
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