Should I upgrade a good working 2.2.3 to 2.2.4 or just wait for 3.0?

I do not see any upgrade when looking on the Web Gui. I am running 2.2.3 on a vMware...

I see something like this on Syslog:

May 29 08:07:59 openmediavault cron-apt: W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://apt.spideroak.com release Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 573E3D1C51AE1B3D
May 29 08:07:59 openmediavault cron-apt:
May 29 08:07:59 openmediavault cron-apt: W: Failed to fetch http://apt.spideroak.com/ubunt…rdy/dists/release/Release
May 29 08:07:59 openmediavault cron-apt:
May 29 08:07:59 openmediavault cron-apt: W: Some index files failed to download. They have been ignored, or old ones used instead.
May 29 08:08:00 openmediavault cron-apt: CRON-APT ACTION: 3-download
May 29 08:08:00 openmediavault cron-apt: CRON-APT LINE: /usr/bin/apt-get -o Acquire::http::Dl-Limit=25 autoclean -y
May 29 08:08:00 openmediavault cron-apt: Reading package lists...
May 29 08:08:00 openmediavault cron-apt: Building dependency tree...
May 29 08:08:00 openmediavault cron-apt: Reading state information...
May 29 08:08:00 openmediavault cron-apt: CRON-APT LINE: /usr/bin/apt-get -o Acquire::http::Dl-Limit=25 dist-upgrade -d -y -o APT::Get::Show-Upgraded=true
May 29 08:08:00 openmediavault cron-apt: Reading package lists...
May 29 08:08:00 openmediavault cron-apt: Building dependency tree...
May 29 08:08:00 openmediavault cron-apt: Reading state information...
May 29 08:08:00 openmediavault cron-apt: The following packages will be upgraded:
May 29 08:08:00 openmediavault cron-apt: iceweasel libavcodec53 libavformat53 libavutil51 libexpat1 libgd2-noxpm
May 29 08:08:00 openmediavault cron-apt: libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libidn11 libmagic1
May 29 08:08:00 openmediavault cron-apt: libmysqlclient18 libssl1.0.0 libswscale2 mysql-common openmediavault
May 29 08:08:00 openmediavault cron-apt: openmediavault-omvextrasorg openssl plexmediaserver wpasupplicant
May 29 08:08:00 openmediavault cron-apt: 19 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
May 29 08:08:00 openmediavault cron-apt: Need to get 0 B/176 MB of archives.
May 29 08:08:00 openmediavault cron-apt: After this operation, 26.6 kB disk space will be freed.
May 29 08:08:00 openmediavault cron-apt: Download complete and in download only mode

Whats wrong?

Hmm i just run manually apt-get update and upgrade. Now I'm on 2.2.4...