Centre Calvin Wellington crosses codes to join Dragons on a two-year deal from Super League club St Helens.
St Helens centre Dominique Peyroux signs a new one-year contract with the Super League club.
Champions Leeds Rhinos will start the defence of their Super League title at Warrington Wolves on 1 February, 2018.
Super League newcomers Hull KR sign St Helens hooker Tommy Lee and Salford prop Jordan Walne.
Audio & Video
Wales and St Helens forward Morgan Knowles reveals all about his World Cup team-mates.
Rugby alerts, newsletters and social media
Get latest scores and headlines sent straight to your phone, sign-up to our newsletter and learn where to find us on online.
Commentaries, clips and podcasts
Enjoy the best debate, analysis and interviews with BBC 5 live and World Service plus our rugby commentary listings.
How to get into Rugby League
How to get into rugby league - a crowd-pleasing, physically demanding game with few stoppages and plenty of pace.
What's on BBC Sport this week
This week's sport on the BBC includes the first Test of the Ashes series, Rugby League World Cup semi-finals and the Abu Dhabi Grand Prix.