Chronologically, it is. There are no other novels planned for the Legacy era. But in terms of publishing date, the Coruscant Nights trilogy will be published after Legacy of the Force.
This question was asked on the wiki: Wookieepedia.
- While true at the time of posting, this answer is out of date. The novel Millennium Falcon, set after Legacy of the Force, has since been published, and the upcoming nine-book Fate of the Jedi series and the stand-alone novels Blood Oath and Crosscurrent will also be taking place in the post-LotF timeframe. You can get a look at all upcoming works at List of future books at Wookieepedia.