Looks like there will still be a true Metroid game IGN interviewed Metroid Prime Producer on what is happening with Metroid and this is what he had to say

“I said this at the beginning, but I’m not involved in the 2D Metroid games that [Yoshio] Sakamoto works on,” Tanabe said. “I still feel like there’s a little more work left for me to do in the Metroid Prime series. I can’t say when, but I want to make another one.”

http://mynintendonews.com/

sure on the NX end of next year

I'm not getting my hopes up. I will be happy when it's going to get officially announced.

Yeah, I'll believe it when I see it.

Nope. Still too devastated to muster any hype.

-sigh-

"I can't say when" implies that one isn't in development. I'd be alright with that if a 2D Metroid is in development for NX.

Vague statements like this don't really fill me with much hope. 

Those quotes don't really say much tbh :(

At least I still have hope, lol. I think I'm the only person on Earth who's actually sorta excited for Federation Force.