Here's the Persona 4: Arena OST ripped from this Youtube playlist:

Persona 4: Arena OST - YouTube (http://www.youtube.com/playlist?list=PL943504FF3458A7B5&feature=plcp)

The MP3s are from the actual OST (that is supposed to be released today) and on HD quality.

256 kbps (90mb):
P4 Arena OST (YTRip 256kbps).rar (http://www.mediafire.com/?jjc0hl2vlfc3j5j)
64 kbps (22mb):
P4 Arena OST (YTRip 64kbps).rar (http://www.mediafire.com/?l9upwrt0kfqxrl1)

You can open Winamp and do an auto-tag to get the tagging in the original Japanese language (also proof that the music WAS extracted from the OST).

Enjoy...

Persona 4's Arena OST doesn't come out today, and these just seem to be all rips already revealed, these are definitely not OST Rips.

The only soundtrack coming out related to P4U is the arranged soundtrack which is on August 2nd.

What DOES come out today though is the Persona 4 Golden Soundtrack.