I picked it up and I have some brief first impressions.
1. The port is awful. God awful. I repeat, God. Period. Awful. If you don't have a 360 controller you can use on your PC, don't touch it. The keyboard controls suck, the joypad buttons don't properly display (the game gives the keyboard keys, not the gamepad keys), the resolution is a bit low, all kinds of stuff. It's also a little bit 'iffy' in terms of load times and such... but bear with me here. Also, resolution, totally not a big deal. It's a sprite-based game.
2. The alternate Princess and Evil Lord 30 modes are in fact available from the start! But, you have to choose classic graphics to play them. These are the original modes, with 30 maps (I haven't gotten through them all, but they're just like footage I saw of the PSP version, so take what I say with a grain of salt here). The game modes actually don't play anything like Hero 30 as well, if that's good news for you. I sure hope it is.
FYI, Princess 30 is a shmup. Seriously.
3. Don't know about the other modes. The game's gone all question mark on me till I finally get around to playing the whole game multiple times. I also don't know if the classic modes are available with the new graphics... so if the modes entice you, be sure you can handle some pixel art. And by some, I mean a lot. Of handheld-quality pixel art.
4. The main game mode is from what I can tell, completely the same as the original. Problem is the menus are awkward because the game doesn't tell you which button is tied to which function. If you care about leaderboards, you might HAVE to resort to the keyboard controls, or to pressing more or less random Xbox 360 buttons.
...So it overall still amounts to 'love it or hate it'. I'm going to be playing more of it at some point, and I'll try to get more detailed information to those who are curious.
All two of you.