Yep, that's right! If you happened to miss the Nintendo Direct from yesterday, here's a trailer to catch you up to speed:
(Special Thanks to GameTrailers for uploading this)
Although there's no information about Rune Factory 5, it's great to hear that the series is actually continuing. After the original dev team went under, the chances of a follow up to 4 were slim. Thankfully the team was reunited under Marvelous AQL though, and that's what makes both RF4 Special and RF5 possible.
So with that being said. I personally cannot wait! As a long time Harvest Moon/Story of Seasons fan, more games in the series is always welcome. Especially when it comes to the Rune Factory side of things.