First: trying logging in with your old name and no password. There were some "issues" during the conversion. Once in, reset the password. If you want to use your old username. The photos linked to that account are gone, so your choice.
Nikon did announce a new camera today
The D800 looks nice and I am a Canon guy.
Generically asking about different brands is just going to start a flame war. How about you give us a budget of what you want to spend and then we can narrow it down? Make a list of a few features you really want, that will help as well.