Art Style: NEMREM released for the European DSiWare store today (500 points), so I'm guessing we'll be getting it on Monday.
I have two of the Art Style games: PiCTOBiTS and AQUIA (guessing at the apparent random capitalization). Both are decent enough for $5 each, but I'd say PiCTOBiTS is the better choice; sort of a combination of Meteos and Dr. Mario with an 8-bit skin. No idea what this new one is about.
Word is they put the update online and have already pulled it due to it causing a ton of systems to lock up when loading a game after installed. So even if you can get it now, might want to wait a couple days.