Thanks for the interpretation patapi
The Production Director talks about how up to that point the series has always shared a common timeline and setting, how this was one of the reasons why people stay with the series, and how the team needed to continue with where it left off.
So Konami admits that the fans are attached to the original Suikoden timeline and setting.
It is confusing that the team needed to continue with where the series left off yet they did not continue from that point
They felt the basis behind Tierkreis' central plot wouldn't fit well into the established Suikoden world, yet they went on to explore the many possibilities, which led to them considering the Million World (localised as the Infinity) concept previously hinted at many times throughout the series.
This is even more confuding, to me it is saying that the central plot of Suikoden Tierkreis was written without even reading the plot of the previous games.
That said, I especially like the second of the two initial images attached in that same blog entry. Its resemblance to Tierkreis' graphics style is very little; a potential hint to a future title?
The first time I saw that image I tought it has to do with the ending of the game. Nice observation patapi