The PSN Blog has announced the most significant PS Vita update in quite some time, and it's now live to download! 

The biggest updates are support for themes, trophy rarity, and what appears to be some adjustments to coincide with the impending release of the PlayStation TV. Here are a few shots I grabbed of the update screens prior to downloading:

The new themes aren't yet live on the PlayStation Store, so nothing looks terribly different tonight. Still, it's exciting to Sony give the Vita some attention.

I'll update this post when more info becomes available!