ActionBarSherlock - Home. Android Views - Custom UI Views. Emerging UI Pattern - Side Navigation. Android UI has been improving with a phenomenal speed in the last year (I composed a small gallery of some apps I really like in Google+).
Many of the changes has been only cosmetic (holo theme, Roboto font, etc). We haven't seen large changes in the way user interfaces are designed beyond that. We might have one such change happening now though. The facebook's side navigation was recently picked up by few apps nearly simultaneously.