I figured I should reply here.
I got my hands on the game this week, and I've started playing it. It's a brand-new style of gameplay for the series, with only characters, enemies and musical cues returning from the original. Claiming that it's a new IP isn't that far off!
The first game left quite an impression on me when I was a child, and the 3DS title has enough cues to the original to push some buttons in my head. At one time, Palutena presented Hydra, the jumping snake boss from the NES, showing his old sprite and sound effect. I had pretty much forgotten how so many sound effects from the original sounded creepy, and getting such a reminder in the middle of the level threw my concentration right out of the window for a few seconds! Likewise, some time later I encountered my first Reaper. I was careless and I almost immediately ran into it's line of sight. It's eyes shut wide open, it started running toward me while it's familiar music started playing. First thing in my head: "OH CRAP GETITOFF GETITOFF GETITOFF!"
The gameplay's fun so far, and it's much less repetitive than I expected. I'm looking forward to the next levels!