Shortly after Nintendo's presentation today, two new Coin Rush level packs were released on the eShop for New Super Mario Bros 2 - this brings the total number of packs up to eight.

New Coin Rush packs
• #7 Coin Challenge Pack C - This three-star difficulty rated pack has you aiming for 10,000 coins. Use an array of power-ups to achieve your goal, including the Mega Mushroom. Different routes can be taken.
• #8 Platform Panic Pack - The four-star rating means this one is a little more difficult. Mario must make his way through levels by staying on various moving platforms. The goal is to get 15,000 coins.

New screenshots of these Coin Rush packs are up on the page. There's also a YouTube video guide to help you decide if these extra levels are for you:

p.s. if you haven't yet picked up your free Gold Classics Pack, the opportunity runs out on January 31st, 2013.