debian unstable repository outdated

[pw]

Hi,

On debian unstable, with "deb http://cdn.debian.net/debian experimental 
main" and "apt-get install -t experimental iceweasel", I have iceweasel 
25.0.

On debian stable, with "deb http://mozilla.debian.net/ wheezy-backports 
iceweasel-release" and "apt-get install -t wheezy-backports iceweasel", 
I have iceweasel 26.0.

Shouldn't unstable be updated first (or at the same time)?

bye,
pw