It simply says my credentials are wrong, but I am able to login on with the very same credentials on account.mojang.com and minecraft.net

It is the one downloaded from mojang.com to test out the 1.6 version.

I tried it under 2 computers and same results

The login servers report online. I can login with previous versions of minecraft too

Why can't I login from the new launcher?!!?!

Username : ---- redacted ----