LastManStanding
Veteran
Think of it like this. The last romantic flick starring Will Smith released in February was Hitch. Which was a HUGE financial success, also this is as good as any month for Will to carry a movie without any major competiton. From April onwards is chalk full of blockbusters (F7, the behomoth known as Avengers 2, Jurassic World, ect.) and this type of movie probably wouldn't play well in Smith's traditional July timeframe. So given the movie's genre and Focus (no pun) plus his previous success with a similar vehicle February makes sense
keep in mind though that Hitch was a PG-13, family friendly movie that was made for 30 million less. Focus is an R rated movie that won't get any of that "family friendly" money that Will has relied on in the past.
either way I hope it does well.