Everything is scaling nicely. Fonts, borders, rounded corners, outlines all scaled according to the screen density.
Sfntly worked out quite well for font rendering on Android. Sfntly did not support the 'ankr' table in truetype font files so I had to write that one in myself, although I haven't been able to test it since I haven't actually found any ttf files that include it. According to Apple's web-site only OSX 10.9+ and iOS 7+ support it thus far. You can add jMonkeyEngine to that list
P.S. I forgot to add DPI scaling to the width of the text field and margins of the VBox, it's just done by multiplying the value by a dpi modifier in GuiGlobals. It can be done using styles to, just use dp(value) or dpInt(value).
P.P.S. My phone is 320dpi, PC is 96.