It's not really the first. HPI had a Nitro Micro RS4 with a .12 in it a while back. It's still on there site in the discontinued section.
XRAY also has the Nitro M18 now too.
http://www.teamxray.com/teamxray/new...&kategoria=678
Strangly they too claim to have the first "Micro Nitro" when the prize belongs to HPI for the Nitro Micro RS4. Man, companies are so lazy they can't even do a little research for themselves anymore! That's just sad.