WarriorStormMan
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In this page Minato seals half of the Kyuubi's chakra using the Dead Demon Seal.
At the bottom of the page he says "my body's gone numb" and "what a heavy chakra."
This leads me to believe that with the help of the Dead Demon Seal half of the Kyuubi's chakra was sealed inside of Minato, as you can see in the same panel the seal on his stomach similar to Naruto's.
With that said, I also believe with the Demon's stomach being cut open by Orochimaru, Minato was released with the Kyuubi's chakra still within him.
in turn this granted him the ability to use a form of Kyuubi Chakra Mode, seeing as that he has possession of half of the Kyuubi's chakra.
This is something I put together after seeing Chapter 631, (which I believe will go down in Naruto infamy because of all the reactions) and people dedating whether Minato is using KCM or BM.
Conclusion: Minato is using Kyuubi Chakra mode or a similar form and not Bijuu mode since there is no Bijuu sealed within him.
Thoughts.....