From GamerBytes: Metanet Software have announced that the second expansion pack for N+ has been announced for release next week, and will have more levels than the last.

This expansion pack contains 225 new levels -- 150 "harder" singleplayer levels, while the first level pack contained easier levels, 50 new race levels, and 25 survival levels - all for 200 Microsoft Points - less than one point for level.

With this announcement they will also be starting a new contest to celebrate - check it out here.