I'm not expecting LTD sales to eclipse 3 million like its predecessor, but Tomodachi seems like a 1.5-2 million seller with an opening of over 400k.
2013 is really going to be a killer year for the 3DS in Japan. On a side note, do you think Nintendo might turn Luigi's Mansion into a franchise judging by the overall success of LM2? 750K seems like a lock at this point. In Japan, Fire Emblem Awakening brought over 30 million in revenue with approximately 450k sold as of September 2012. LM2 is going to outdo it and doing so in 3 weeks :) This is truly the year of Luigi!