Whilst I've heard and briefly played previous games (half an hour at someone else's place), Awakening was my first entry to the franchise.
Has there been any word on more entries? I recall reading, just recently, that everything hinged on the success of Awakening, and it did relatively well. So can we expect another in a couple of years, or is it gonna be a 4 year+ life cycle?
Worldwide, Awakening was probably the best selling entry in the history of the series. It was getting close to passing Fire Emblem GBA in the US last I heard, and was the best selling entry in over 20 years in Japan. No idea about European sales, but I would imagine that they were pretty good as well.
I would definitely expect another 3DS game at some point. Fire Emblem Awakening came out in April 2012 (in Japan). They may want to push FExSMT first, but I am expecting another entry by 2015 at the latest.