Necessary to update 2.2.3 to 2.3 with v3.0 coming?

Gallery version = 2.2.3 core 1.2.0.5
PHP version = 5.2.6 cgi
Webserver = Apache/2.2.10 (Unix) mod_ssl/2.2.10 OpenSSL/0.9.8b mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635
Database = mysqlt 5.0.67-community-log, lock.system=flock
Toolkits = ImageMagick
Acceleration = none, none
Operating system = Linux watermelon01.watermelon503.com 2.6.18-92.el5PAE #1 SMP Tue Jun 10 19:22:41 EDT 2008 i686
Default theme = matrix
gettext = disabled
Locale = en_US
Browser = Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4
Rows in GalleryAccessMap table = 42
Rows in GalleryAccessSubscriberMap table = 197
Rows in GalleryUser table = 2
Rows in GalleryItem table = 197
Rows in GalleryAlbumItem table = 10
Rows in GalleryCacheMap table = 0

Are there any security issues/patches in v2.3 that would make it prudent for me to upgrade our 2.2.3 to version 2.3? Or are the changes just feature related?

I'm wondering because there's Gallery 3 on the horizon and my client (site owner) would like to wait on paying any costs to upgrade now to 2.3 and instead spend the money on upgrading to 3.0 early next year (hopefully).

Thank you.