If you're talking about the "Dark" theme, it's the same grey color scheme as before (the old "Dark" theme that was only being used by 31 people) but with the orange highlights (which will be likely reworked).I have to agree with Christilou that it's quite a busy look, especially on a phone. Lots of different shades of grey, dividing lines in grey, blue and orange, arrows both pointing to the poster's name and just randomly up for quotes... It does feel a bit aged, I'm sorry to say.
I'm not sure I know what you mean about the arrows and quotes; XF has always had an arrow next to the quoted persons name, the sidebar of the quote is the only part new and that orange color will be likely reworked.
EDIT: ... and most of the orange is now gone from the "Dark" theme along with some tweaks to make it closer to the old "Dark" theme.